I agree, I don't know where other people live or if they go out at all in a major city, but scooters ride dangerously fast on sidewalks, in parks, even on the road alongside cars.

I completely understand it's due to the lack of alternative riding infrastructure (ideally they would ride on bicycle lanes, but not everywhere is like The Netherlands), but you wouldn't ride a bike on a sidewalk, and riding on the road is very dangerous on these scooters.

So yeah they're either a menace to pedestriands because they don't drive safely on pedestrian areas, or they're a menace to cars because they're very unstable on the roads and put themselves in danger, least of all because most people who ride them don't really know road legislation.