I don't know if he is guilty. Similar incidents seem to happen to often in the US. It reflects badly on the police and it seems to give a lot of black people validation for their gut feeling that there are still inequalities in the American society.
I can't say I can't understand that. Statistics don't lie. I think it is virtually impossible to understand as a caucasian what its like to be black and live with that heritage. It only gets worse if we don't even try to look in to it and our hearts and try and understand.
This incident imo showed a serious problem area in society, especially in America, but also present in for example our Dutch society. The way of protesting is decided by raw emotion, raw emotion with a much more deeper background then just this incident. I don't want to judge it, but ofcourse authorities have to stop it. I hope someday these incidents will bring an open debate, but I doubt it, people are scared of the topic of racism/equality on a deeper selfreflective level.
But again, can't say ifhe is guilty. American cops, compared to most European law inforcers, are quite forceful in their approach. It goesmuch deeper, but I doubt getting into it will intereet anybody here. I think the police chief over there raised good points, even though he shouldn't have brought themalmost as an excuse. Thats not what America claims to stand for.