Your implication that people who carry military equipment aren't meant to act like "normal people" would be incorrect even if it were the case that most police officers carried military equipment (which they don't.) The actions of the police in the posted article don't really support that assertion either.

US is a pathological case. I wrote this for the sake of fellow Europeans as well as the rest of the world, because I see the increase of anti-police sentiment (including linking to that "Don't talk to the police" YouTube video) in countries where it's not warranted.