Iām pretty sure Vareesaās quest texts imply this pretty heavily, considering she has you hunt down fleeing Blood elves, and even suggests killing the Dragonhawks despite providing materials to prevent them from flying.
I think killing the Blood elves was certainly the prerogative for some of the Silver Covenant, like the one feeding them to sharks, or drowning them in the sewers, but there were many who didnāt partake in the bloodshed, and simply followed orders.
The poor dragonhawks. 
What did they do to anyone?
Innocent Bystanders of a butchering.
I will avenge them!
I can sympathize but unfortunately with the awful retconning that went on with Kaelāthas after the scourge attack, thereās really no coming back without some good writing and attention to detail. The blood elves ARE high elves, they just renamed themselves after 90% of their people were destroyed in the scourge. The racist Garithos is why the high elves (aka: blood elves) left the Alliance. You do have void elves now though, who are blood elves who were high elves who somehow are totes fine with demonic energy. You can also give them all blue eyes now.
As to the lore that saw high elves on the horde sideā¦ I really, truly love this game, but I am about to cut myself over the sloppy writing. They retconned Kael from a shy, humble, benevolent prince to a mustachioed tyrant the moment he touched Outland, and now theyāve retconned him again as a petulant snob and spoiled brat in SL. For those that donāt know the history, Kaelāthas is a hero. He was studying in Dalaran when Arthas killed his father. He is a shy, benevolent, caring prince. He raced home and blew up the Sunwell to stop the scourge from pouring through, saving the Eastern Kingdoms but sentencing his own people to mana starvation. Boats of fleeing belf children were sunk and 90% of his people were slaughtered. He moved to strike back at the scourge with his last handful of fighters and Garithos, the epic racist who hates all who are non-human, sent him alone to face impending doom knowing he would be overwhelmed and perish.
The Naga Vashj shows up and offers aide and together, Vashj and Kaelāthas forces are successful against the scourge. Garithos is displeased by this and now has the excuse heās needed to eradicate Kael. He deems Kael a traitor for working with the Naga, of course he despises the Naga also, and uses this a justification to throw Kael and his men in prison to rot for the next thousand or so years, or however long belfs live. Luckily Vashj breaks Kael out of jail, but at this point his people are dying without their sunwell. He writes of his hesitation to make a pact with Illidan to save his people, considering it a necessary evil, but then he and his people are considered traitors for having anything to do with Illidan and Vashj, after Garithos tried to exterminate them, and thatās how high elves became a Horde race.
Then we got the Retcon. The moment Kael sets a toe in Outland he is suddenly a mustachioed villian who turns on his people and is fully corrupted. Even though we have Void elves and Illidari demon hunters who are totally okay with demonic energy now, even though we have Illidan who is a legend now, even though Illidan had a castle of slaves and concubines and we sat through a whole expansion getting lectured by holy characters for going after Illidan with hate in our hearts, Illidan who blows up a Naaru and even the high prophet himself doesnāt blink an eyeā¦ Thats all fine, but Kael? Nope, he has to go to hell and get spanked and emasculated for who knows how many eons. He doesnāt even get to see Vashj. Mind you she doesnāt get spanked for eons, she goes straight to Maldraxxus to have some fun. We even have Sylvanas now saying no one had freedom or a choice in life so why is Kael being the only one punished for what he couldnāt control??? This writing is awful.
Blood elves without their sunwell are wretched. Nightborne without their nightwell are withered. There was even a Nightborne boss we had to fight in a raid who thought she had to side with the legion to save her people, sound familiar? Rinse and repeat. Donāt get me wrong, I love the universe, but the writing team needs to consist of people who care about the warcraft universe and its characters and who have the talent and creativity to handle it.
The Retcon of Kaelāthas the moment he touched Outland was sloppy, he was used as a prop to make a quick dramatic story. If you get the Artifact weapon, Feloāmelorn, you get to read 1 page about how Kael reforged it (his fatherās sword) and how he fought Arthas with it over and over and over, countless times, and neither could best the other, but in the entire wrath of the lich king we donāt get a glimpse of that, only that Sylvanas is the brave hero that dare go after Arthas. At least the teams at Blizzard cared enough to bring him back in the blood elf heritage armor quest to give you a glimpse of who he really was. And Iām thankful they tried to incorporate him into the new story in Shadowlands, but all theyāve done is deny his justice and torment him for the retconning while everyone else is skipping around like its a Disney story.
Iām afraid at this point the next thing we will see is that Sylvanas is a hero who just had to kill her own to give us freedom from fate and everyone will be happy and good is evil and evil is good, but still fcvk Kael right? He alone will still magically just have to pay for crap he had no choice in and awful writing with no resolution, no justice, nothing. They couldnt even let him play a hand in taking out KelāThuzad. He doesnāt even get to launch a single fireball at that lich, who weāve killed what 4 times? He just has to forgo everything and sit there and be sorry. Tyrande pops up out of nowhere and is totes fine. Ysera gets a whole redemption story but Kael is spanked like a petulant child, an uttery mockery of who he is before the retcon. I am sticking with my head cannon that he made a humunculous of himself and actually peaced out from WoW years ago and went on to Dota2 as the Invoker (who is based off Carl / Kael) to do something more sensible with his eons of knowledge and time. I love WoW and will probably always play it, but I will never stop calling out this horsecrap.
Well my DK finished the 4th threads thing at level 58.9. I guess itās dungeon spam time.
BGs, better odds of piling up enough honor to buy and upgrade a decent weapon as soon as you ding 60
I only do pvp stuff on epic bg weeklies.
Iām not a pvp person either, but if thatās where theyāre hiding the damn weapons then I guess thatās where I have to go 
I still have a 158 MH.
I am suffering from indecisiveness.
Poor Avarie.
Well, I took Wylee into BGs after I lucked into a 168 dagger but couldnāt get an offhand to save my life. Today I got a 171 staff from a WQ though, but the odds suck so badly!
2 dungeons in and Iām half way to 60.
Iāve claimed nothing of the sort ā I said the Silver Covenantās primary motivation, as an organization, is upholding the laws and traditions of Dalaran. Whether their relationship with the Sunreavers is cordial, or cruel, is largely irrelevant to thisā¦ and Iāve provided numerous explanations for why detaining someone, even with prejudice, isnāt the same as existing solely to cause that someone harm.
You, on the other hand, are candidly suggesting that the entire purpose for the Silver Covenant, as an organization, is to maim and/or kill Blood Elves at every opportunity. This is not corroborated by anything, so unless youāre prepared to provide a few citationsā¦ youāre just churning out head canon. 
These arenāt exactly āthe reason for my existence is slaughtering Blood Elvesā-type responses to a situation wherein a political adversary, whom you already suspected to be mildly disloyal, is being charged by the governing authority (i.e. Jaina Proudmoore, who in this instance has the authority of the Kirin Tor) with aiding and abetting terrorism.
If it hadnāt been the Sunreavers, and instead the Hordeās liason in Dalaran was the Royal Apothecary Society or the Korākron, the response wouldāve been identical ā removing the means for an enemy to flee is sort of Apprehension 101.
Which Iām pretty sure isnāt brutally murdering itās citizens in various cruel methods, which you yourself have shown to have no issue with. So once again, youāve proven that you have zero clue what the Silver Covenant is, nor do you know what the traditions and laws of Dalaran are.
I suggest taking a nap because your responses to this have been downright silly and horrifying to say the least.
In other news, my DK is now level 60 and ready to mingle.
They were following the directive of the highest authority in Dalaran, which is in keeping with both tradition and law.
The fact that you donāt like how it turned out is completely irrelevant to whether or not what happened was in alignment with the social or legal paradigms in the city-state.
Itās āsillyā to ask that you corroborate your absurd comments? 
Guild name checks out lol.
Edit: And name.
Imagine justifying undeserved mass murder.
Justifying undeserved Mass Murder is not only silly, itās horrifying.
Then again considering who Iām talking to, it shouldnāt be a surprise.