US police are trained to assume everyone is a potential assailant armed to the teeth and about to pull a gun at any second.
its a big part of why people hate cops, not only do they shoot first and ask questions later, you can be an innocent tax payer and they will talk down to you like theyre youre boss and youre an idiot piece of shit. my friends dad is a fucking surgeon and when i was 14 i was in the car with his family and a cop pulled him over for something dumb, the officer yelled at him and talked down to him like he just murdered someone and that my friends dad was just lucky the cop wasn't hauling him to jail
the vast majority of police instantly make situations hostile