For what it’s worth, DC Capitol cops are generally more professional and better-trained than the average city/town cop. (For one thing, they have to deal with tourists, so they need some level of public relations/social skill.)
There was a funny incident this winter. For some reason, someone decided to direct the Capitol Police to enforce an old ban on sledding down Capitol Hill. People came in protest and started sledding anyway. No one ended up being tased or beaten up, and now Congress is likely to lift the ban. Some people know how to pick their battles versus resorting to tasers, fists, and billy clubs within five minutes.
I suspect even NYPD wouldn’t resort to the kind of crazy violence observed in the incident in Santa Monica. Slap a parking ticket on the car (no ID needed, just a plate #) if it’s parked during “no parking” hours and move on.