Only the judgment of history provides the evidence, - as Arthur Koestler once commented :
"-- The continuous disasters of man's history are mainly due to his excessive capacity and urge to become identified with a tribe, nation, church or cause, and to espouse its credo uncritically and enthusiastically, even if its tenets are contrary to reason, devoid of self-interest and detrimental to the claims of self-preservation. We are thus driven to the unfashionable conclusion that the trouble with our species is not an excess of aggression, but an excess capacity for fanatical devotion. --"
Second, you're going on record that prohibiting sex with animals is "contrary to reason?"
Third, and most importantly, you didn't provide any evidence of anything. I asked you to show that people X did action Y for the reason you said they did, and you responded with "People do all sorts of stuff because they're fanatical." That's like a judge saying to a prosecuter, "Can you show that the defendant shot the victim for his money instead of self defense" and the prosecuter says, "Well, violence on TV is bad for kids."
Can you back your accusation up or not?