Do we seem to pick and choose which self destructive behaviors to regulate?

You have to wear a seatbelt in a car but you don't have to wear a helmet on a motorcycle. You can smoke tobacco and drink alcohol but can't smoke pot. Possessing cocaine will get you a prison sentence but having a prescription of an opioid will get you treatment. Hiring a prostitute is illegal but a one night stand isn't. Having an automatic weopon is illegal but having seventy loaded hand guns is ok. What did i miss?