(CNN) -- In the NFL, controlled violence is, and always will be, an essential part of the sport. As fans, we have no problem with coaches telling players to run hard, hit hard and tackle hard, because we know that we can't take that kind of contact and tough physicality out of football. However, as a long-time fan of the NFL, when I heard the audio of former New Orleans Saints Defensive Coordinator Gregg Williams instructing his team to injure members of the San Francisco 49ers before their playoff game in January, I was really bothered. Williams explicitly commanded his defense to target particular players with the intent of injuring them and taking them out of the game. Talking about 49ers star running back Frank Gore, Williams said, "We've got to do everything in the world to make sure we kill Frank Gore's head. We want him running sideways. We want his head sideways."
@highlight
NFL Commissioner Roger Goodell turns down appeals of bounty punishments
@highlight
New Orleans Saints coordinator had told players to target opponents for specific injuries
@highlight
Bill Bennett says such behavior goes way beyond the normal physicality of football
@highlight
He says Goodell needs to respond to the evidence of harm from concussions in football
The NFL is a valuable institution that has done much good for our youth and @placeholder has done a fine, exemplary job so far.