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but there's a large minority (I wouldn't be surprised if it was a majority, even) of cops that get involved in the field just so they can bully people around.
I disagree completely. I'm sure they exist, but most cops get involved to help and protect people. Now, there is a difference between where they start, and how they respond to dealing with the shit of society, shit that will never stop being shit and rarely get punished for the things the cops have to clean up.
Actual, meaningful punishments need to be handed out, but because of the overcrowding (thanks drug laws) sentences get shortened and pleas get handed out like candy.
You can't stop the kind of stuff that happens in that video. You can educate the police and keep the public informed of their rights and informed of proper police conduct (what cops can convince you to do and what cops can legally do are often two very different things), but you can't prevent every incident like this.
You should read (the awfully titled) Cop in the Hood. A Harvard Sociology professor gets turned down for a study with Baltimore City police. The lieutenant suggest that if he wants to still do his study, he'll just hire him as a cop. The guy spent 18 months as a cop working 7 p.m. to 7 a.m. in the bad part of Baltimore and documented what he saw, what he did, and the cops around him.
http://www.amazon.com/Cop-Hood-Policing ... 0691140081