Some police are racists. Some police aren't.
Some police like to bully. Maybe some don't.
Some police rape. Some police don't.
Some police are looking for opportunities to shoot people. Some police aren't.
For any individual belief, some police hold it, and some don't.
For any individual action, some police take part and some don't.
Anything you can say about police will be true for some, but not true for others... except for one thing: all police are bad guys because of the things they do-- things inseparable from being a police officer and enforcing "laws. Just as you can't say "not all rapists are bad guys", it makes zero sense to say "there are some good cops".