If they're so "in charge" then why does marijuana still grow? Didn't they make a law banning it's existence? I mean, they do have god-like powers to make a plant of their choosing stop growing, right?

They're not in charge of the laws of nature, no matter how often they pretend to be, no matter how hard their idiotic worshipers vote for them to become gods... It just won't work. They have delusions of grandeur, and you have delusions that they're not delusional...