Proponents of legalizing marijuana aren't necessarily advocates for it's use or benefits: for example, I am one. I have absolutely no interest marijuana, and don't particularly care for people who's identity is "I smoke weed" (I mean, the same would also apply for alcohol too).

But that's quite different to thinking the current regime of anti-drug enforcement, incarceration, and generally catastrophic waste of time, resources and lives - is at all a productive or even useful thing to do for society.

I'll discourage everyone from drinking alcohol or smoking weed, but that's very different from thinking any of this should be banned.

Though I'll happily commit to the notion that I suspect you'd get a lot fewer fights among dedicated stoners then drinkers on a friday night.