If the DM says it’s fine, and the concept fits, then it sounds like there’s no hand-waving to be done.
I don’t have to justify my character to you.
And that ‘something’ is something that can be worked around. Per Blizzard’s own words and deeds, but even before that, the Draenei are not robots. Some get desperate.
The “DM” here already said it wasn’t.
I’m sorry you’d like something to be something here, but it just isn’t.
Uh… They said it’s fine. That’s why the options are opening up. Sorry if you disagree, but the ruling is made.
Objectively false. Being a warlock is not inherently evil. You clearly did not play the warlock order hall class. They’re doing bad for righteous reasons same as demon hunters.
You can have that opinion but it is not supported by the lore.
If you look at even the cata dungoens you see some dranei casting shadowbolts. In forge of souls you see even night elves casting shadowbolts. The iconinc warlock spell.
The game shows you why I race dislikes them, and both has members of the race already doing stuff like feltotem warlocks. Or grimtotem sorcerors that had mages for a long time. Or tauren mages. Etc. WoD had dranei warlocks too. We even see dranei primalists. They aren’t really off the table turning villain or turning into an anti hero.
Simplist explations like Black Harvest Recruiting is a simple enough explanation for all the races honestly. The black harvest helped return xera. And helped protect azeroth, although they used dark magics. However the PC chooses to go about it, npc rationales can help mold our stories. Most humans hate witches. (Warlocks are supposed to be witches honestly, irl warlock is often the masculine form of the word and in spanish you are just brujo/bruja which is a Witch). Warlocks being accepted by societies isn’t the norm in most races. But as part of the army they tend to not be so judgemental. It’s often the Civilians that are more so judgemental.
No, you see? Draenei are a 100% hivemind, thinking and acting in perfect and unbreaking lockstep. Never does a Draenei grow desperate, ambitious, or rebellious; they’re all perfect little beings in perfect little places that do their little jobs perfectly. Why they even adventure is a mystery; they’re already sorted by some Universal Order.
– What lore purists actually believe.
You should look up the word cannot. As nothing is preventing it. Not physically anyways.
I mean they might be called man’ari by fellow Draenei. But that doesn’t mean they weren’t still born and grew up or at least spent the last 13k years as a Draenei. So they can choose to embrace or reject that term.
They are saying it’s fine in 10.1.5 
DM can change their mind. Especially when presented with facts and logic.
Just linking the story of the warlock class order hall. Honestly them recruiting more and the other class halls is simple enough. I can imagine the Illadari recruiting more demonhunters in Illidan’s abscence for example if they are getting hints of an imminent threat. Or maybe blizz will have a Nathrezim invasion sort of thing to mimic what marvel did with that shapeshifter race (Skrulls).
Or maybe they just need more bodies to maybe want to explore the fel zereth. I would love that someday.
I’d argue you don’t even need that, you can justify it by having a paranoid-enough member of a class. For instance, a DH could decide there’s another threat coming and they’re not being listened to by their peers, so seeing potential or necessity, they ‘gently encourage’ the PC to make the sacrifices necessary to become a non-elf DH. Just like how DKs are ‘recruited’ without much say of their own.
Why not? Where is that written or stated?
I mean, the “DM” changed their mind so now clearly they can, but if you’ve got something to point to that shows a clear ret-con I’m interested, but otherwise it seems like everyone seemed to mistake “generally, almost exclusively do not” for “can not”.
Wow blizz ty for adding more freedom of choose to my character customize such terrible dev
It is an absolutely disingenous way of putting it up.
No, they don’t turn man’ari for being warlocks. They turn man’ari because the literal demon God Sargeras himself transformed them with his own magic.
That is the literal lore.
I can’t wait to play a Draenei Warlock- been waiting for this since Legion. I hope the devs give us the red skin and green eyes too. Maybe even some demonic horn styles in the future as added customizations, too.
However, I completely disagree with LF Draenei being able to have the warlock class. They are zealots heck-bent on destroying the Legion. Demon Hunter, yes but Warlock absolutely not. And there needs to be a good reason for Draenei becoming (playable) Warlocks. A simple quest, dialogue, and/or cutscene to explain this class inclusion.
For all the players complaining about the race/class option, more options are good. If you don’t like the race/class opening, simply don’t use it but let the players who want them enjoy the new options.
Oh no! I can’t believe Blizzard is adding a race/class combo that’s entirely optional to play. Those jerks!
Where are the Red Eredar then, if Lore doesn’t matter.
Its taboo. Kinda hot ngl.
I’m just waiting to race change my lock to Zandalari Troll tbh.
I nabbed a race and faction change when they were on sale for my two locks so they can be tauren and HMT as soon as the servers come up 
I’ve been waiting for this for along time.
Not true.
Has never been true.
But a whole lot of them did on AU Draenor when they joined the Sargerai faction.
There is nothing preventing a Draenei from going, “You know what? These are powerful tools, I’m going to use them” like the Orcs and humans did who also suffered at the hands of the Legion.
Semantics. Man’ari is a faction, not a race. Sargerai is a faction, not a race. Technically Draenei is a faction, not a race. Lightforged/Lightbound is a faction, not a race. They’re all Eredar as a species. Picking up a grimoire and summoning an Imp doesn’t mean that a Draenei packs up their stuff and takes a shuttle offworld to go find survivors of the Man’ari faction.