Clearly yet another example, if we didn't already have enough, of thuggish, fascistic, white supremacist police letting white people get away with their misdeeds.
They won't be treated harshly as ethnic minorities would be if they did the same thing. Arresting means nothing if they aren't as strict with the white guys as they are with the non-white guys.
Leaving aside the fact that there seem to be a few people in that crowd who look as though they are from a minority, how do you know that they won't be treated as harshly?
There is already plenty of research showing that non-white offenders are given harsher sentences than white offenders for the same crime. It's even the case in schools where principals might give a white student detention for disrupting class but suspend a black student for several days.