Earlier quoted context omitted.
I was just in LA, and scooters are everywhere. However, they're all parked upright, and in most cases even organized into a nice, out of the sidewalk path, line (initially I thought that Bird/Lime/etc were paying people to do this, but I saw a mix of different brands aligned as often as just one). When they first launched in LA, this wasn't the case, it was just as much of a free for all as SF. SF succumbed to regula…
Counterpoint, I live in downtown SF and walk everywhere (Lived in lower polk, work in fidi, now live in Nob Hill). Even at their peak, I never once had a scooter in my way. Characterizing the situation here, even at its worst, as a "free for all" is a gross exaggerating.
So I'm not surprised you have a totally different view. Your view is going to reflect the values of the people around you. You may be surrounded by polite people.
Take riding on the sidewalks. Any sensible person would understand that operating a vehicle moving 15-20mph on a 3-foot wide sidewalk, in a dense urban area with people coming into/out of buildings, delivery personnel wheeling hand trucks, small children, parents with strollers, people walking cats and dogs, etc is just dumb. Yet, I see kids in Oakland doing this daily, and even though it's codified into the Oakland Municipal Code that this is illegal (motorized vehicles on the sidewalk), people do it anyway.
I got so fed up with this, I (intentionally) veered about 6 inches left walking on the sidewalk last week, causing someone going ~15mph to get knocked off of the scooter. Other times, I just stand in the middle of the sidewalk and play chicken. I weigh 240lbs so it's usually pretty effective.
It is indeed up to the law to legislate what is and isn't allowable behavior. But at the smallest scale, it's neither possible nor desirable to get a cop standing on every block, or surveillance cameras everywhere. You just have to trust people will exercise some level of decency and concern for others, which seems notably absent from day-to-day interaction where I live. You can't change that with laws.