Police officers have a rather taxing job. Some of the stories I've heard through various people makes me wonder how they keep their sanity at night. Keep in mind they have to put up with ignorant, uninformed human beings at the bottom of the barrel who put their pain and suffering above the safety of others. This is why they are essential.
With that being said, some police officers can and are "bad people" to a certain extent. But within the same token, a good amount of former thieves and criminals became police officers. What better place to operate in preventing what you used to know best?
And for the record, unless it's a 100% case, which it rarely is...I am not for the unjustified complaints towards "police brutality". Some people need to just sit down, shut up, and not get butt-hurt about the fact that someone is telling them what to do or how to behave. Many of times it's the criminal who is doing the crime, whether knowingly or unknowingly, that causes the disturbance/issue in the first place.
AKA: You wouldn't get tazed if you just SAT.THE.HELL.DOWN...and stop flailing the arms as well please. Although it does make for some entertaining internet compilations.