The only part of the conduct of any one for which he is amenable to society is that which concerns others. In the part which merely concerns himself his independence is of right absolute. Over himself over his own body and mind the individual is sovereign.
I've been to enough other countries in the world to know what happens when you have socialized single-payer health care. It works. People don't get sick as much. They don't lose their life savings with a catastrophic illness like cancer or AIDS.