If we know anything about man, it's that he's not pacific. The temptation to butcher anyone considered undesirable seems to be a common temptation, not always resisted.
There is no arguing with the pretenders to a divine knowledge and to a divine mission. They are possessed with the sin of pride, they have yielded to the perennial temptation.
That free will was demonstrated in the placing of temptation before man with the command not to eat of the fruit of the tree which would give him a knowledge of good and evil, with the disturbing moral conflict to which that awareness would give rise.
A good many young writers make the mistake of enclosing a stamped, self-addressed envelope, big enough for the manuscript to come back in. This is too much of a temptation to the editor.
If priests were allowed to marry, if this would be an optional thing, and if he could have wife and children, he would certainly have less temptation to satisfy certain sexual impulses with minors.