What about it, Meta? he snapped. No doubts? Do you think that destruction is the only way to end this war? I don't know, she said. I can't be sure. F… - Harry Harrison

Without being too clinical, let’s say his brain was affected.

Just because you know a thing is true in theory, doesn't make it true in fact. The barbaric religions of primitive worlds hold not a germ of scientific fact, though they claim to explain all. Yet if one of these savages has all the logical ground for his beliefs taken away — he doesn't stop believing. He then calls his mistaken beliefs 'faith' because he knows they are right. And he knows they are right because he has faith. This is an unbreakable circle of false logic that can't be touched. In reality, it is plain mental inertia. A case of thinking 'what always was' will also 'always be.' And not wanting to blast the thinking patterns out of the old rut.

I have done more in one day than you all have done since you arrived. I have accomplished this because I am better at my work than the rest of you. That is all the information any of you are going to receive. You are dismissed.