Better re-think that one.
It's unfortunately the case with tough district/city people with criminal record. Once you live in violence for more than a couple weeks, and have to assume physical threat and retaliate, I'm pretty sure it changes you somewhat fundamentally, and unfortunately those people rarely have the proper support to adjust to civil duties.
"Police violence calls for measures beyond de-escalation training": https://www.scientificamerican.com/article/police-violence-c... — "The police department in Camden, N.J., for example, was disbanded and rebuilt with a new vision in 2013."
"What the data say about police brutality and racial bias — and which reforms might work": https://www.nature.com/articles/d41586-020-01846-z
"More Than Half of Police Killings Are Mislabeled, New Study Says": https://www.nytimes.com/2021/09/30/us/police-killings-underc... — Researchers comparing information from death certificates with data from organizations that track police killings in the United States identified a startling discrepancy
"17,000 Killings by Police Have Gone Uncounted Since 1980": https://www.rollingstone.com/politics/politics-news/how-many... — There have been twice as many deaths at the hands of cops than the federal government has reported, top medical journal finds
Search-fu is failing me, but ISTR there are studies with data indicating that when police are called for non-violent situations, there is a high chance (> 50%) of the aggressiveness of the cops making the situation violent, especially if disadvantaged populations (ethnic or gender minorities) are involved. This is especially true for property crimes (there was a rather visible case of someone murdered by a now former police officer — on camera no less — because he was accused of using a counterfeit $20 bill for a pack of cigarettes, perhaps you remember it?)
Remember, the police do not exist to prevent violence. Most of the time, they’re not even intended to fully and properly investigate violence perpetrated against others. No, they are there mostly to (poorly) investigate property crimes against the ownership class. That they occasionally manage to perform good investigations doesn't really help with the times that they make things worse, don't do anything, or make cases up from whole cloth (perhaps you’ve heard of the police misconduct in the Central Park 5 case, or do you just believe the cops all the time).
It is party result of them being above the law. And partly result of training that does not teach the de-escalation at all, but focuses on taking control, being dominant at all cost.