NBC – Sports fans can be very forgiving. Just look at the Chicago Cubs, who fill Wrigley Field every year despite last winning the World Series 106 years ago. When athletes bet on sporting events, however, all of that changes. Otherwise compassionate fans who would be willing to look the other way in most cases have been known to permanently turn their backs on athletes who bet, or who get in on gambling schemes that can affect the outcome of a game. Why is this? Michael Vick operated an illegal dogfighting ring, but that didn’t stop him from signing a…