First: Fuck the alliance scum bags!
Second: there so many flaws in your logic ^^
Bloodelfs had very less to do with the mana bomb wich was mostly Garrosh.
Ofc lets try the 3rd reich proposal and claim all people that were alive under the führer Garrosh are at fault as he was - lemme tell you what they werent.
And you Alliance is not so good either. First of all (you know whats coming) Arthas, second who hold the orcs in kzs? right the humans.
Third: Fuck the alliance.
4th: And if that all is not enough -> sit back, take a breath and remember its just a GAME where you are supposed to have fun!