That's the most shallow, adolescent argument I see on Free Republic. It really should be beneath all of us.
What are laws? I mean really, at the foundation of it, what are laws?
They're the codification of a society's morals. In our form of government, they're what the majority has judged immoral in their society.
Murder is illegal because it's morally wrong. The same with theft and rape. It's all morals.
The majority can and does "impose" its morality on the people. That's what government and the rule of law is.
So, the real question, the honest question, is where should the moral line be drawn? To either pretend that there isn't one in the law already, or that there shouldn't be, are both short-sighted, foolish angles.
Secondly, the crimes you mentioned directly harm others. I'm concerned that some conservatives are becoming increasingly interested in protecting people (and their souls) from themselves and want to involve Gubmint in the solution. Whereas a true Christian would understand that the answer is between the person and God. Government has nothing to do with it.