Lots of terrible examples to go around across the globe. A few years ago a woman who is a fan of the University of Alabama football team murdered another woman

Lots of terrible examples to go around across the globe. A few years ago a woman who is a fan of the University of Alabama football team murdered another woman who was a fan of the same team. Why? Because the victim wasn't upset enough about the team they were both fans of losing a game earlier that day. So being a rival isn't even required for violence to happen. Heighten emotional states are inherently unstable.