I have no problem with the attack on Theramore. You misunderstand what I wrote. My problem was the way Thrall behaved which A) Goes against his character and history built up with Jaina. The Thrall Jaina had allowed to kill her dad would have spoken to Garrosh and B) Massively openly double standards. When it's his ex horde doing something thats fine. But when someone gets the power to wipe them out in response... well he can't stick by his "No interfere guns" and doesn't even take responsibility for his actions. He made Garrosh Warchief, he refused to help Jaina when she asked for aid and now here he is betraying Jaina, again.
Remember, while Jaina allowed troop movement, she herself committed no troops and did not participate. As an Alliance member she did her bare minimum so as to remain as neutral as possible. As a Neutral member Thrall did the bare miminum so as to allow his mistake to grow and shoved his head in the sand.