The job of the police is first and foremost to 'keep the peace'. This often means confronting and detaining criminals who resist arrest, but in a safe and non-violent manner if possible. What we are seeing more and more in America is not 'policing' but 'executing'. Rather than seeing themselves as 'peacekeepers' officers are acting as judge jury and executioner and the fact that the person being detained is guilty of a crime in no way justifies sloppy policing that leads to their unnecessary execution. And it is a CRIME to accidentally KILL someone...Negligent Homicide!
30 years ago my wife was arrested and jailed because we didn't have the $25 on hand for a stop sign violation she got at 3AM. I went into a blue-faced rage against the police. If I were Black and it happened today I doubt I'd be writing about it now.
I think that decades of the insane drug war have driven cops crazy. And too, the Republican tax cuts on the rich have left police terribly underpaid and under trained and with bad morale.