Oohh, you have access to magical knowledge, you were able to peer in each and all of their heads!
This is a highly complicated subject with probably hundreds of factors influencing decisions of individual officers and large groups, and solving it requires no doubtedly a lot of work, time, money, structural reorganisations, cultural changes, training...
But I'm sure you know better because you know that there is a single reason for all of it! You know that it is something along the lines of "ACAB", amirite?
Complicated problems do not have simple solutions. I know that "defund the police" is a popular slogan, it's als dumb. You NEED police. You just are stuck with very shitty police, but defunding it, or just saying acab is not going to solve anything