You are confusing "crazy and insane" with the words "ruthless, evil and cold hearted". The guy is explaining calmly why he did what he did, the fact that he didn't like doing it, but felt it was necessary and forced himself to do those acts in order to achieve political effect. He is right in the head, however his perception on the world is very different from the norm.
That is why it is ludicrous to assume that WoW had any effect whatsoever... not when at the same time the guy writes a manifest hundreds of pages long with political and ideological messages.