People have been doing drugs for ages. Why is that an argument valid for keeping booze legal, but not pot?
I'm holding the line; I'm preserving a sane way of life; I am on the ramparts thrusting my sword into the guts of the howling barbarian.
I don't want anymore ugly crap in my culture!
We're debased enough. We have our sins, so be it. We don't need to add more. No good can come from it.