> In short: I'm the most vanilla, square, anti-drug person you can find. I don't want to use them, and I think other people would be better off if they reduced their usage as well.

You say you don't understand why drugs are illegal. I think this is your core misunderstanding.

You are not the most anti-drug person I can find. I've never used alcohol or cigarettes (I didn't even use painkillers when my four wisdom teeth were taken out), and spent the majority of my life admonishing the use of caffeine.

I am not even anti-drug compared to most Americans. A substantial portion of America believes that using drugs (illegal drugs only, of course) is _morally wrong_. That is why they have favored sending people to prison instead of rehab. Because it is a violation of the social contract they favor to be under the influence of such substances, and that by using them you are no longer able to execute your duties as a citizen. And you aren't. I don't want you high on meth when you vote. I don't want you high on pot when you drive. I don't want you coming down from heroin when you serve on a jury. Those actions have consequences, all actions as a citizen do, because we cannot isolate from each other. Breaking those commitments _could be_ considered morally wrong, and not just from puritans or fundamentalists.