Just read washingtons notes about the militia troops in general during the war. Drunken brawlers (at least he thought so of the pa troops)Generally speaking laws against marijuana exist because everybody knows smoking marijuana makes you stupid. So when it comes to guns & weed, the theory is that people who regularly make themselves stupid shouldn't be armed.
This begs the question, and I have to ask --what about people who are naturally stupid, all the time?
Folks who on their best day are still dumbasses, who are prone to making stupid impulsive emotional decisions?
I Think the Founding Fathers would not have approved of the gov't disarming people who fit that description.