Isn't enforcing morality the only goal of The State ?

Violence is immoral (out of self defense of course), it's the only thing that we have to make illegal, and the only thing that a State should be concerned about.

As Frederic Bastiat states in his essay "The Law":

- "the law is only the collective organization of self defense", he says

So basically the only question we should ask ourselves is if the non aggression principle is violated, and that is obviously subject to interpretation depending on the context, and the judge himself, the juries etc...

There is no perfect answer to that, but the State is responsible of enforcing morality, but not defining in the first place. Morality is defined naturally then leading to the natural law/rights principles.