I've never seen a complaint about scooters that doesn't just boil down to "they aren't obeying the rules". The rules shouldn't be that way! Riding scooters or bikes on the sidewalk is miles safer than riding it on an unprotected roadway, and should be allowed everywhere. You can look up the statistics anywhere for pedestrian fatalities from collisions with cars vs. pedestrian fatalities from collisions with bikes or scooters. They differ by more than a few orders of magnitude. Sidewalks are pitifully small in most places and this is the problem that should be solved (optionally segregating the enlarged sidewalk), not pushing scooters and cyclists out into traffic.