Becoming a "militant" anything enables you to act badly in public, filter information selectively, and generally act in a way indistinguishable from a paranoid schizophrenic with an impenetrable delusional system.
Sorry. In my response I said fanatic and you had said militant. I tend to equate the two.
I have some training in Abnormal Pyschology. I do see some similarities between the rigid mindsets of seriously disturbed people and some of the anti-evolution posters.