[MichaelZuo]

It seems nonsensical then?

You would have to pretend non-linear negative externalities don’t exist, or can be waved away with some magic wand.

[devilbunny]

Don’t reduce it to the simplest, weakest version. Pure, untrammeled libertarianism has its weaknesses, but “unless it hurts others directly, you should be allowed to do what you like with yourself” isn’t a bad starting point.