Just on the outside looking in....

Most "civilian/press" recorded high speed police chases end up showing some sort of brutality or simple over-use of force. The excitement from the chase gets them all hopped up and I guess sometimes they make bad decisions because of that. This cop in general was probably hopped up and looking for the anxiety outlet, and sadly, the dude with the camera was the victim.

Correct though, I am quite sure it's a small % that stoop to that though. Sad indeed.