These e-scooters could be a really great way for many cities to decrease short-haul car dependency, but they really need to be off the sidewalks. A motor-propelled machine going 15 mph doesn't belong on the same surface as a baby stroller, a senior citizen, or a person with a disability. They belong in the bike lane (which should exist in the first place), and their speed should be capped in areas of dense foot traff…
I'm strongly in favour of more scooters/e-bikes in the city (and fewer cars), and I'm also strongly in favour of writing tickets for anyone who is antisocial enough to ride on the sidewalk.
If traffic cops spent a week or two rigorously enforcing the law, I bet you'd see a sharp drop-off in this behaviour.
(However given the number of cars, including cop cars, that I see blocking intersections after the lights change, I'm not sure that there's really a commitment to enforcing traffic laws in SF, even where this would be a revenue-generating activity).