I've dealt with a lot of police officers through my line of work. I believe most are good people trying to do a difficult job as well as they possibly can. I understand that some aren't, and some are simply unsuited for the job. There's a certain type who goes into law enforcement for all the wrong reasons. They're insecure and want to become police officers in order to finally have a feeling of power. These are the dangerous ones. They're the ones who become obsessed with the trappings of the job such as weapons & uniforms, flash their badge at every opportunity, try to set records on the number of traffic tickets issued, go overboard in the whole cop culture thing, and tend to be bullies.
These are the ones you can easily picture standing in front of a mirror practicing their quick draw and imagining themselves as some sort of supercop in a movie. They tend to be young, overly aggressive, and feel like they have to prove themselves. During high stress situations they don't have the temperament, maturity, poise, self-confidence, and common sense to handle things appropriately and tend to overreact or fall back to their "Down on your knees, PUNK!" approach. The video of this shooting screamed this type of officer to me.
