It’s already been proven that the Orcs who were corrupted by demonic influence were also the one’s suffering from the lethargy: https://wowpedia.fandom.com/wiki/Lethargy_of_the_Orcs#:~:text=racial%20withdrawal%20from%20the%20volatile%20warlock%20magics
And can we please stop lumping the Horde as if they’re some sort of singular entity? Or that there was some sort of singular event where they were all just simply rounded up in one go? The underlying mentality of that is quite problematic because it shows you’re not trying to understand the timeline of the conflict and the different variables that were at play.
Blackrock: went back to worshipping demons https://wowpedia.fandom.com/wiki/Blackrock_clan#The_Third_War
Dragonmaw: leader was literally using the demon soul https://wowpedia.fandom.com/wiki/The_Battle_of_Grim_Batol_(History_of_Warcraft)
Frostwolves: went in to hiding and have a notable history of rejecting demonic worship https://wowpedia.fandom.com/wiki/Thrall#Liberation:~:text=accused%20the%20Frostwolves%20of%20hiding%20away%20in%20the%20mountains
Bleeding Hollow: implied to be fully captured
https://wowpedia.fandom.com/wiki/Warcraft_III:_Reign_of_Chaos_Game_Manual#Ner’zhul_and_the_Shadow_Clans:~:text=Bleeding%20Hollow%20clan%20were%20rounded%20up.
Warsong, Shattered Hand, Thunderlord and Laughing Skull: This one is a lot more complicated cause Grom only invaded after the events of Tides of Darkness, and we don’t know much about what happened to the other clans.
https://wowpedia.fandom.com/wiki/Warsong_clan#Revitalization_of_the_Horde:~:text=Dark%20Portal%2C-,Grommash%20led,-the%20Warsong%2C%20Shattered.
Warsong (again): They seemed to still be fighting to some degree, but this is the only one where there’s no clear evidence of any form of demonic worship (post Beyond the Dark Portal and pre Ashenvale).
By the time we get to WC3’s Prologue, they were already captured. And given your propensity to not want to accept things without definite proof, then I think it’s just as fair to make the claim that the Warsong clan was in fact suffering from withdrawals which is what made their capture possible:
https://wowpedia.fandom.com/wiki/Warsong_clan#Revitalization_of_the_Horde:~:text=Grommash%20and%20the%20Warsong%20were%20captured.
And yet a case like Thrall happened. Where Aedelas Blackmoore was deliberately training Thrall to lead the Orcs to become part of his own army to take over the Alliance. If a despicable man like that could think of some sort of strategy that could result in his personal gain and giving the Orcs some sort of autonomy then why couldn’t the so called greatest minds of the Alliance find a better solution?
And may I remind you, Antonidas and the Kirin Tor had already identified that the Orcs were corrupted and influenced by demonic magic and decided “well it’s their issue to deal with.”
Their ignorance and unwillingness to understand and work with the Orcs is what led to the rise of the Scourge, and them being the victims to the very same Burning Legion that the Orcs were victims to. Even after Medivh warned them.
I’m honestly so sick of this narrative and terminology. It also shows an underlying issue where you don’t understand how different societies develop in proximity and relation to the available resources/climate/conditions/proximity to trade/knowledge diffusion etc…, and that just because a society does not fit with the world view that you were raised in that it somehow makes them ‘savages’ or somehow have the inability or incapacity to develop in such a way even if they had the same access to those resources.
The Orcish clans did not have the same access to knowledge or magic like the Humans did. And the Humans only gained access to this because of the High Elves during the time of the Arathor Empire. They had a millennia to develop without a major existential threat threat (since the Troll Wars had ended). This would’ve obviously led to a lot more refinement in terms of social stratification, knowledge transfer, agricultural advancements, animal domestication, development of cultural values, art/music, and such.
Compare this to the constant state of war that Draenor was in. If it wasn’t rock or plant elementals trying to kill the Orcs, it was the Gorian Empire. And if it wasn’t that, then it was some sort of disease like the red pox.
Then, the Orcs were specifically targeted by Kil’jaeden after being discovered by Talgath due to how Velen and the rest of the Draenei had settled in Draenor. Again, something completely out of their control.
The Orc clans neither had the time, resources, or access to develop culturally in the same way that the Human and Elven kingdoms did. And despite that, they developed a shamanistic culture that the Gorian Empire wanted for themselves. Imagine what the Orcish Clan (or likely Empire) would’ve been like if they had a millennia of peace?
Just explore your logical inference for a minute. If the Orcs truly were out to destroy civilizations, then how on god’s good Earth did they manage to live peacefully with the Draenei until the Burning Legion’s influence? How were they capable of trade and friendship? Especially when they were given the opportunity to do so.
I feel like a lot of people constantly forget that the entire premise of WoW is that hatred breeds hatred, and that it’s the ignorance of that that makes you vulnerable to your own eventual destruction. The Human Kingdoms could not find a better way to deal with their hatred, and it led to the fall of Lordaeron. Then the Horde and the Alliance could not resolve their hatred and it led to multiple other wars with countless of lives lost.