This is essentially the argument that "All Cops are Bad"; some few cops are bad, but all cops willingly participate in a system that protects and enables those

This is essentially the argument that "All Cops are Bad"; some few cops are bad, but all cops willingly participate in a system that protects and enables those bad actors. The US military is a good comparison, they routinely dishonorably discharge soldiers who misbehave or fail to behave in honorable ways; police seem much less able to manage themselves in the same way. (Not that the US military doesn't have its own share of problems, nor do they always kick out the people they should, but they seem to have a better culture of doing so than most US police forces. Both could certainly be improved further.)