Power-hungry cops. This man was clearly in shock from being hit and an attempted robbery. The cop is an aggressive jerk who wants to maintain his power in the situation. This is why cops suck. Enforcing the law does not mean you're above it and can assault anyone you want, much less the victim of a crime.

I hope this cop spends just a few days in jail, with the general population. Maybe his ego can be brought back down to size.