The NFL has made rule changes to reduce the incidence of head injuries, and IMO it's worth going a season or two to see if they improve things.<p>The nature of the rules in U.S. football creates situations that are inherently more dangerous than its overseas counterparts like rugby or Aussie rules. In those sports it is very rare for players on opposing teams to and run directly at each other from 10s of yards/meters away. Most tackles are chase-downs where the runner is pulled to the ground at low speed.<p>I disagree with Klein's assertion that the violence is at the heart of the NFL's appeal. There are numerous more violent or dangerous sports, like boxing, MMA, or even NHL hockey (which as straight-up fist fights) that are not nearly as popular.<p>The sport is far less dangerous or violent today than it was 20 years ago, but it's far <i>more</i> popular. The NFL has reigned in the violence with rules like illegal contact on receivers, hits on defenseless receivers, roughing the passer, spearing, chop-blocking, face mask, blow to the head, horsecollar tackle, etc.--and as they have done so the game has only gained in popularity. This disproves that the violence is the heart of the appeal.<p>Personally I think the appeal is that football is a) extremely athletic, b) extremely complex tactically and strategically, and c) perfect for TV because every single play has time for instant replay and analysis. In addition it involves a lot of ballistic trajectories, which are always popular:<p><a href="http://online.wsj.com/article/SB10001424052748703779704576074222543274268.html" rel="nofollow">http://online.wsj.com/article/SB1000142405274870377970457607...</a>