The guy is a pyscho who murdered 2 police officers.
There many people at the game who have spoken out about that incident.
Had I been in the crowd at that HS game, I would have told him to quit harassing people as well.
If you are that interested in him, put his name in Google and read up on his past history
You ignored and are incorrect about what occurred just days prior to the shooting. He was the victim of assault and theft in that incident. And you're the one who provided the video link.
See the tagline.