I can't imagine what point you're trying to make.
"It might slake some thirst for revenge." Most people call a murder conviction justice and not revenge.
"But ultimately is it not the worst result?" Compared to what? What do you believe the best result would be?
"It pretty much alleviates the the police department itself of any responsibility." It seems like you're saying that the police department should be held responsible and that by one individual officer being held responsible they are being let off the hook. I don't think that's true. There has already been a financial settlement. Seeing police convicted of the crimes they commit while on duty is very rare. This sends a message to every police officer that they are not above the law. It's not about just this one officer and this one incident.