Chris Brown was not happy when Robin Roberts asked him about Rihanna on Good Morning America today, and he made his anger known by storming out, screaming, cracking a window, and tweeting, "I'm so over people bringing this past shit up!!! Yet we praise Charlie sheen and other celebs for there bullshit." Though he later deleted the tweet (the only part of his rampage he could take back, alas), did Brown have a point? After all, Sheen has a rap sheet full of assaults against women, a fact that his many recent interviewers — including CNN's unctuous Piers Morgan — have been content to gloss over or ignore entirely. What's to blame for this disparity?