Originally Posted by
Sae
It's been a while since I've even thought about Theramore but it could be that it's considered unjustified not because it wasn't a legitimate military target (it was), but because of the means by which it was destroyed. A mana bomb is instant, leaves zero survivors (despite what you think, civilians are important, and killing them IS a war crime) and is honestly pretty cowardly for the "muh honor" Horde under Garrosh.
Now if they attacked Theramore with a force of soldiers or by sea, won through skill/numbers/attrition/whatever, and allowed civilians to evacuate (like they pretended happened with Teldrassil) then I don't think it would have been considered unjustified.