I was travelling a few years ago, and hanging out in the hotel bar in Portland, Maine, and I listened in on a heated conversation between some guy and a lady whose husband is a cop. They were discussing police brutality and the protests at the time (Baltimore maybe?), and the lady's point was basically "do whatever you want with regulating police behaviour, but I will take my husband coming home at the end of the night over anything else"
It's possible with the falling rates of crime, this may just solve itself (though increasing police training and standards is a good thing regardless).
You observe an outlier but fail to put it into context. The police in the US aren't comparable to police in other western countries. As a result, comparing crime rates is disingenuous.
The lady in your anecdote is also painfully disingenuous. Being a police officer isn't really dangerous. The death rate is much higher for landscapers, bartenders, taxi drivers, etc.. Roofers have a mortality rate of 4x the police. Even then, most police officers die in traffic accidents, not homicide [0].
[0]: https://qz.com/410585/garbage-collectors-are-more-likely-to-...