Despite never having been on the wrong side of the law, I mostly despise cops, because generally speaking they're corrupt bullies and liars.
That being said, if you've ever been in a heated argument with a black girl before, you'll understand when I say I'm surprised all this cop did was punch her in the face.
The video only shows the tail end of the incident, so we don't know what had happened up until that point. I'm going to assume it didn't go straight from jaywalking to getting punched in the face. Somehow it got escalated. Sure, it may have started for jaywalking, but instead of just taking their $25 tickets, from the beginning of the video it's apparent that these girls decided they wanted to be confrontational. If you're going to take on a cop and win, it's going to be with an expensive lawyer before a judge, or with the right investigative report done by the local news station. Getting physical with a cop is never a good decision, because the cop will NEVER be the one to back down.
tl;dr some cunt puts her hands on a cop and gets what's coming to her