American police training routinely promotes an us-versus-them mentality. It instills the idea that every situation is a threat that must conquered and dominated. You can see this in their comments that the streets are "a war zone" and talk about being "warriors", and a routine glorification of violence and stereotypes. This is why American police routinely escalate situations. Note on the video, the police don't just pull guns, but then start agressively barking orders.

Contempt of Cop is real.