"One bad apple spoils the bunch."

If you have 10,000 good cops, and 1,000 bad cops, you have 11,000 bad cops.

Here's the thing, a lot of people like to compare groups: cops vs druggies, cops vs gangbangers, cops vs antifa, etc.

But of those groups:
One was founded upon the finding and retrieval of slaves.
One is paid for by taxes.
One receives military augmentation via vehicles and weapons.
One has a disproportionate kill rate amongst the general population of POC vs whites.
One has an actual union + lobby.

The police as they are are not a means to combat crime, they are a means to facilitate money for a very non-fair justice system that itself is rife with corruption.

Edit: and while there are many cops who are "good people", there are way more "good people" in other careers that don't have carte blanche to kill.