Lots of people have difficult stressful jobs dealing with people who don’t have much respect for them. That’s not an excuse for criminality, though. Take medical professionals. In the public mind, there are few things more horrifying and reprehensible than the doctor or nurse who deliberately kills or neglects their patients. There’s pretty much universal agreement that this is not okay, and that it is in fact a morally worse crime than normal murder or neglect, as it is done by someone in a position of trust. It should be the same for police.
There has to be a way forward when it comes to police reform, but it is a valid question to ask whether or not policing itself takes a particular toll.
It seems like many of the worst offenders have been mostly stagnant at their posts for many years - surely getting in fresh faces that have had a chance for more modern training would help break some of this mentality of "corps over country".