All the same, what do you mean by dehumanizing the Iranians with antisemitism? You have to go a fairly long way into conspiracy theory territory to make out that Ahmadinejab didn't utter highly provocative statements and insinuations about the genocide of the European Jews. To oppose Israel, it's not necessary to call the Holocaust in question (and yes, that is the effect of Ahmadinejab's remarks). I don't know why Ahmadinejab spoke as he did, but I don't doubt he did so.
I'm just extremely sorry for most Iranians that the lunatics have taken over the asylum. But why did it happen? Because the US lost the Iraq war, and the winners were the Iranian fanatics.