How Argentina's biggest soccer rivalry became a violent embarrassment to the world

The second leg of the Copa Libertadores final between Boca Juniors and River Plate was supposed to be a glorious celebration of football. Instead, it showed the world all of the sport's ugliness. The second leg of the Copa Libertadores final this past weekend -- the Superclásico, the final that was supposed to end all finals -- was postponed because of violence. As the Boca Juniors bus left the team hotel and headed to the stadium, River Plate fans attacked it with projectiles, breaking the win...