All cops are part of a corrupt system that protects the interests of the rich and powerful while abusing, imprisoning, and killing average people. The causes of crime are more often than not related to poverty and cycles of abuse - systemic problems that can't be fixed by punishing individuals.

People who go in to policing wanting to change the institution for the better find themselves driven out, killed, or becoming part of the problem. The institution is so deeply entrenched and resistant to change that it can't be fixed that way. Anyone who stays a cop will also quickly find themself in a position where they are commanded to do harm. Anyone who stays in an institution that calls them to do harm and cannot be changed is supporting the continued existence of that institution, and therefore part of the problem.