You already can’t legally do a lot of things that appear to only be about yourself because society as a whole said it’s not good for everyone. You can’t buy cocaine. You can’t commit suicide (it’s illegal almost everywhere) . You can’t ride a motorbike without a helmet, or drive a car without a seatbelt. You can’t even build a house without a smoke detector or remove the airbags from your own car.

To some degree, if you want to, go buy 100 acres in the middle of nowhere and go nuts. Or move to a country that doesn’t care about all those things.

If you want to be part of a modern clan, it’s not helpful to do things that indirectly hurts everyone, even if on the surface it only impacts you and your body.

If you want all the benefits of a modern society, it asks you to not be a net negative. This is 10x important in countries with universal healthcare, ie all but one.