There are some good cops out there but all cops are inherently bad.
Cops are not legally obligated to protect and serve. They could literally refuse service even if you're about to die and they won't get in trouble for it.
Cops abuse the system multiple times to get what they want (see civil asset forfeiture)
All cops stick up for each other even when they are clearly in the wrong.
If a cop needs an excuse for doing what they did they'll just say "I was just following orders" like the national socialists did.
The system put in place is corrupt.
We need to go back to the 1880s where the Sheriff is democratically elected by the townspeople and if the sheriff becomes corrupt himself then the townspeople should be able to take him out of power without repercussions.