Though in some occasions like the drunk driving, I rather have it prevented from happening.

Though it isn't prevented. People still do it. In fact the LAW never seems to be why they don't do it. They don't do it due to conscience or someone stopping them, convincing them, etc. They get caught doing it by the LAW and punished but the LAW does not actually prevent them from doing it. The fear of the law doesn't appear to either.