I’m guessing the reason the jerks are driving on the sidewalk is because the roads are unsafe for them. Maybe cars (the vehicles making the roads unsafe) are the real problem?
Mixing operation of motorized vehicles in the same space with vulnerable humans and their pets is the real problem. Operating them on the sidewalk is an instance of and amplification of the same problem.
I’m wildly sympathetic to the anti-car position, but I’m not at all sympathetic to excusing motor scooters on sidewalks in the interest of advancing that position.
Can’t say the same about other US cities.