To be fair, this kind of idiocy is in no way limited to scooters. In NYC we don't have Bird yet but we do have tons of delivery people on bikes (electric and traditional) that do stuff even more dangerous than this. One time while I was coming off of a steep downhill a delivery guy wheeled his bike out from between two parked cars without looking either way, and another delivery guy who was about 30 feet in front of me hit the bike, went over the handlebars, and smashed his face on the ground. He was visibly dazed for minutes after and bleeding from his head; it would have happened to me if I was about a second ahead of where I was. I've also had electric bikes whiz by about 2 feet from me on the sidewalk at 20+mph many times. They are nearly silent, so it's easy to imagine abruptly turning around or shifting over (as pedestrians are wont to do) and very getting severely injured. I've seen plenty of other awful and dangerous behavior in addition.

Fortunately, I don't see this as much with non-delivery cyclists. In NYC at least, this is mostly a problem with delivery people; the extreme pressure they are under to deliver on time, combined with the fact that many of them have clearly received no safety training, seems to be a major cause.

NYC's bad cyclists (and, in the future, bad scooterists) are actually scarier to me than NYC drivers because they can come at you from so many more angles thanks to their small size; it's much easier to predict and avoid cars and even pedestrians. (People are also used to cyclists here, so the cars are paradoxically not nearly as scary to me as they are in less dense environments.)

[edited to clarify that I was also on a bike]