A man once broke his arm. Rather than seek out a wise and experienced medical doctor to set and help heal the broken arm, he decided to just fiddle with it and fix it according to how he thought it should be fixed and healed. Now, how much more important than a broken arm is a broken soul?
Should we just remove all warning signs and fences from the edges of sheer cliffs, and just allow people to decide for themselves if playing near them is foolish or not?
I see your idea of a "warning sign" is the loss of liberty. What an altruist you are.
Morality imposed and compelled by force is not morality at all.