The suspect woke up and asked to speak to a lawyer, to which the police officer told him to suck a dick and eventually started beating the man. Another officer declined to investigate the incident.

It isn't a "someone else" scenario, it's the police force demonstrating that they can't be trusted. This isn't a rare issue, we do it all the time. Dirty cops get found out and then years of cases may need to be reopened, because now evidence is no longer viable.