In Australia, smoking weed in public is illegal. Some dude was arrested for it in Sydney. Some other dudes held a protest to draw attention to how dumb this was. And this random crazy guy at the protest was literally the best guy in the world to interview about it. His part starts at 1:20.
tl;dr: Why should weed be legal? Because unlike tobacco cigarettes, it "Kills no cunts."

[Via Reddit]