You're right. This is a good reason to restrict this class of drugs. There is a finite usefulness, oh which each person who uses them consumes a tiny little bit.
You can't be serious, right? I don't even want to imagine how many people would accidentally kill themselves or at least seriously damage their health if that was the status quo.
Is that my job to prevent? If someone wants to do the most damaging things possible, to intentionally kill themselves, should I feel entitled to stop it?
People should be free to do stupid things, so long as they don't hurt others (the antibiotics example that another poster gave us a much stronger argument)
This sounds like a libertarian take, in the sense of "libertarians are like housecats - convinced of their own fierce independence but totally dependent on systems they neither control nor understand".
