The sidewalk in San Francisco is already not a safe place.

Everyone is looking down at their phones. If they aren't, it seems like a large amount of SF residents don't know how to walk on sidewalks appropriately (stick to one side of the road when someone is coming the other way, don't walk 6 abreast, etc.).

I have seen so many people bump into each other and get into accidents simply walking. I wouldn't mind scooters on the sidewalk because then people will actually be forced to be aware, instead of walking around like mindless zombies staring at their phone and bumping into poles