The Justin Bieber Tour of Contrition continued this week, with a long-awaited mea culpa in the form of the newly muscled pop brat’s Comedy Central Roast. A roast is a peculiar American tradition in which you prove you are no longer an unbearable upstart who pisses in cleaners’ buckets by allowing comedians and celebrities to say truly vicious things about you in a public forum, while television viewers scour your face for approval, or upset, or any emotion that belies the dead-eyed numbness and despair that childhood fame has brought upon your life.