It's not that I think that all police officers are somehow evil and out to kill black people, or whatever. The issue is that we give police special and unique powers, and those special and unique powers should require special and unique accountability. Unfortunately, we tend to do exactly the opposite -- give police less accountability than the average citizen for his or her actions (this lack of accountability can be blamed both on the Left and Right -- the Right tends to fetishize and hero-worship police, seeing them as the last bastion against creeping barbarism, and the Left refuses to take on the powerful public unions that represent police).
This is a great example of exactly why I get angry. It causes us to wonder how many of those police stories from the past were just as full of sh*t as this officer's, but we lacked the ability through modern video to find out. The police officer's actions in trying to cover up his misconduct (e.g. by screwing with the timeline in his dispatcher calls) turns out not to be unique (the most common variation of this is the now-ubiquitous officer yelling drop the gun about five seconds after he has already shot the citizen). In fact, it seems to happen so often that one wonders if there is not an informal grapevine among police that train new officers in these cover-up techniques.
People often ask me in the comments why I don't respect officers for the job they do. Sure I do -- policing is one of the few clear-cut government roles all but the most extreme anarcho-capitalist libertarians support. But I am angry that my and others' respect for officers has been used historically against the public as a tool for evading accountability.
Update: Making this proposed legislation in AZ to outlaw recording of police in public a really bad idea.