The chance that anyone can have a gun is above 0 everywhere, it's a meaningless statement. Sure, the chances are higher in the US than just about everywhere else, so why not just say that.

It's totally unreasonable for the officers to act this way, and I don't think it's particularly obvious that escalating to guns drawn makes them any safer. Maybe it does, but maybe it turns them into a threat in the minds of the people they think they are protecting themselves from.