Why we punish a person who doesn't wear the safety belt or hat when driving a car or a motorcycle? Is s/he impose any harm to other people but him/herself?
Along with the same chain of arguments, there are some people who think that drug abuse should be a legal choice for those who want it; they don't impose any harm to nobody else themselves. Why is it wrong? or right?
On the former question, how much I pay for car insurance is a function of how much accident claims cost insurance companies. People who do not wear seatbelts cause themselves greater injuiries, which lead to higher insurance claims, which lead to higher rates for me. So it's far from clear that one who doesn't wear a seatbeltharms only h'erself (even waiving the harm s'he might be doing to family and friends). The same is true in the latter case: It's not entirely obvious that people who abuse cocaine, say, harm only themselves. More needs to be said, obviously.