I asked a question.
And yes, since you have doubled down on the assumptions, DC is entirely different from those places. It was intentionally designed to be. Where you see these patrols are not near commerce, shopping, etc. The patrols I see are near federal buildings, monuments, and tourist areas as well as Union Station which is a transportation hub. Nobody lives or really even works hotels near those places.
In other large cities, tourism and commerce are interspersed with with everyday life in a way that does not exist in DC.