This story doesn't make me want to bash police; it makes me want to bash police chiefs.
It isn't all due to police chiefs. Some of it may be due to training, but a lot of it is due to nothing more than the personality of the person behind the badge. They do stupid, arrogant stuff not because the chief told them to do it, but just because they can.
The worst part is that you can't even complain, because of the "thin blue line." For some reason, even otherwise "good" cops generally seem to be willing to line up in support of the bad cops, and other bad cops are often only too happy to join up in harassing anyone who has the temerity to report an incident of abusive "policing."