Bicycles powered by humans are "helmets only" mostly out of necessity. You're generating a lot of heat, and things can go really badly for you if you're working up a sweat in full motorcycle gear.

Well, talking about the weight of the vehicle is a red herring here. With the exception of getting hit/crushed by the vehicle, the human component of going down is all about speed, fleshy weight, and ride-height.

I'm also not expecting people to ATGATT while on the scooters, but without doing that, injuries are definitely going to rise with increased use.