We all support morality at the point of a sword to one extent or another. All OT civil laws were exactly that. The question is how much of the moral law ought to be codified into civil law for the restraint of sin that the gospel may go forth?

It's much less than most "conservatives" would have us believe, IMO.

Unless you are a full anarcho-capitalist that wants the state abolished entirely, then you are theonomic to some extent. It's merely a question of where you draw the line.