Oh trust me, I wouldn't feel good about riding an e-scooter on a sidewalk either, they're too fast and it's a nuance to the pedestrians sidewalks are built for. But I also wouldn't feel personally safe riding an e-scooter on a street; the small wheels of a usual scooter make it inherently unstable at the sort of speeds the electric motor can easily propel it to.

Basically I don't think there is any safe and responsible way to use an e-scooter. I don't think they should exist, it's just a bad idea. e-bikes are great though.