You can show them fact after fact that destroys their position, and they will keep coming up with justification after flimsy justification. But the truth of the matter is that whatever it is they want to punish or prohibit is just something they personally don't like.
And any justification beyond "I don't like it" is a lie.
It reminds me of the debates I have had with Creationists. Science and facts don't matter to them. In fact, usually they eventually wind up saying "I don't care what the facts are; I'm going to believe what I want to believe". That's fine as long as you don't impose your beliefs on anyone else, through "law" or through any other form of coercion.