What about the danger to pedestrians hit by the driver of a scooter?
The most dangerous thing we can do is let ourselves mentally relax when we're on one, as if we're not on a big sharp chunk of (relatively) fast metal and inertia.
A helmet wearing person slamming headfirst into the nape of somebody's neck at 15 or 50 miles per hour is probably going to kill them.
The risk is lower on a scooter than on a motorcycle.
On the road, yes. But motorcycles don't routinely take the sidewalks.