I agree as long as it doesn't endanger others, but when it does you start to have a more complicated ethical problem. E.g. I'm generally in favor of at least a

I agree as long as it doesn't endanger others, but when it does you start to have a more complicated ethical problem. E.g. I'm generally in favor of at least a pressure to vaccinate for vaccines that are effective at reducing spread, but less so in cases of vaccines that are not sterilizing. In that case you're only taking a risk with your own health but are having a negligible effect on the overall spread of the disease. Things also get more complicated when dealing with minors, such as when parents refuse medical treatment for minors due to religious (or "new age" or political) reasons.