In sports, everyone is a winner—some people just win better than others. Like Mike Tomlin, who managed to avoid joining the list of all-time bonehead coaches ever in the history of anything. Winning is helpful!
Let's just be clear on this—if you thought Bill Belichick was a moron for going for it on 4th-and-2, then you're going to have a hard time justifying an onside kick when your team is ahead by two with four minutes left. The kick failed (even though it probably shouldn't have) and the Packers got eight quick points out of it. Just because Green Bay left exactly enough time for Ben Roethlisberger and Mike Wallace to score a game-winning touchdown, that shouldn't be enough to get Tomlin (and us) off the hook for seven days of recriminations from angry ex-football players. But it will.