In a nutshell: There are two critical factors for understanding and dealing effectively with overly aggressive police behavior. The first is fully understanding how bias works, because until you do that you cannot possibly comprehend what it takes to deal with it judiciously. The second is the blatant fact that we human beings are primates and we behave biologically in similar fashion to our Simian cousins. Understanding alpha-male and alpha-female psychology and temperament and the long term effects of experiencing the additive nature of adrenaline rushes at a slot machine frequency is crucial. As long as we ignore these realities, we are always going to come up short in solving the problem of overly aggressive police behavior. This is a matter of public safety not a political issue. I've been studying this subject for decades and I am an ex-Dallas police officer.