So, since these premises are set in stone, fanatics will be hostile to anyone. Including when stated the obvious conclusion that they are fanatics.

These are among the most dangerous people in the world. They are convinced of anything(by someone or something) and this is where danger lives. At any given moment, they can be presented with new "evidence" that they are "under attack" and need to respond as harsh as possible. Although they are still not in this stage(which is an advanced stage of fanaticism), they are on the way there. We have examples of this in many religious cults, including christianity. But then again, this is a violation of the above premises, so you get the point. They are in a self contained loop of ignorance even thou they will never admit it, because again, the premises.