What, then, if anything, can one legislate, pray tell?
Look, lets be clear here. The law both prescribes and proscribes human action. All human action is governed by morality. Thus, any legislature, by definition, is the legislation of morality in some way or another. The real question is whether or not it is the legislation of correct morality.
So let us hear no more of this "You can't legislate morality!" twaddle.