It's a way to stop a fight

Someone played too much True Crime: Streets of LA

If there's a crime in progress in the area, let's say a little old lady getting mugged, you can either:

1. Get out of your car, kung fu the assailant into submission, and handcuff them (you get good karma)
2. Drive over everyone involved (you get bad karma)

Either way, you get points for it and the message "Crime successfully resolved"