Unless his peers are being paid by the local municipality to perform some civic duty, I'd say your question is rather specious. If some people in an organization are acting like assholes, and the rest of the organization doesn't do anything to stop them, what should someone not in the organization think of it? Cops have a duty to encourage trust between themselves and the people they police - sticking together to protect guilty cops is the exact opposite, and ends up in the situation we currently see.
Police in other countries are afforded a great deal of respect, so clearly it's not impossible.
Yes, and they are openly admitted to as being something to work on, throughout the ranks of the police force. Major changes are made in the police forces concerned, and the level of professionalism increases. Compare that with the US where these cases are fought tooth and nail by the concerned police department, and little to nothing comes of them.
You are making the case against the US's police force and for the German police force's way of handling things. I don't know if that was your intention...
Hell, TOS episode Trouble with Tribbles, Scotty starts a bar fight.
I believe he started a bar fight with the Klingons. I agree that's not a great thing for him to do, but it hardly disproves what I was saying.
1: No code table for op: ++post