There's a very strong social system in which people help each other and to challege some of the evanglical beliefs can threaten our social links. We didn't even study the Bible all this closely, we use the Bible study aids more than we use our own senses. In this tight, narrow world, it's very easy to repress our natural opinions or feelings. We are afraid of losing friends and so we repress our natural self and pray harder and study the Bible harder. But like Jung said, sooner or later the repressed desires and fear will return with force that can be truely shocking.
Some people fall completely apart and do weird things.
Some become abortion bomber. Some commit murder. Most just become blind with prejudice, from mild to extreme. I suspect that your ranting fundamentalist is expressing his own fears of the power of free love because to embracing it would be to undo the entire social and mental structure of his life. Same thing happens on the show.