There’s an episode of The Simpsons where Bart dreams of being a rock star. Rather than picturing himself popular and swathed in adoring fans, instead, Bart pictures himself drunk, bloated and dyspeptic. In The Simpsons, it’s a joke. In Hollywood, it’s the truth. Fame is rotten, but the rot has allure. That’s why famous people find it so hard to be good, because people want them for their fame, and unadulterated want…won’t judge, even the most heinous crimes. Famous people act badly the way sinking ships set off distress flares. Every ugly scene is a warning: “I’m poison” it says. Joaquin Phoenix’s new movie, I’m Still Here, is a quasi-comedy about toxic celebrity. It’s the sort of movie Mel Gibson should watch on a loop.