The point is why shouldn't the Iranians be armed with nuclear weapons to defend themselves from Kahanists and American imperialists.
Why shouldn't a violent rapist have a gun to defend himself from his next victim? That is in essence what you're asking.
I really don't think that sadistic dogs should have nuclear weapons. What can I say? I guess I'm "insane".
By the way, Kahanists are not "imperialists". We're survivalists. The comparison is insulting.