I don’t think a cop can psychologically hold up being on the street for years on end without losing some perspective. The job fundamentally blasts you with the worst of people, and it’s easy to develop a rotten world view if measures are not taken to handle that input.
A maximum limit of X months per year on the street or something, the other half in some other duty.
My take on the Floyd murder was there was definitely an element of a power complex that the cop devolved into over years.