Even if there is a wave of bombings some day, I'm not going to stop going to games. I'm just going to arrive and depart at odd times. It's sort of an Austin Powers thing...be an international man of mystery who slips quietly into baseball games when there's one out in the top of the 2nd inning.
I've never been to a major college game anywhere but Nebraska...but the parts of Lincoln near the campus are SO crowded after a game for HOURS. They could do serious damage at will.