Its always those motherfuckers that cause the problem. Here in australia the speed limit for scooters and ebikes is 25km/h which is a pretty safe speed. Notwithstanding getting run over, a crash at that speed rarely causes a serious injury, just an ouchie really, some scratches and bruises, but rarely anything broken. At 35km/h the chance of a break grows considerably larger, and at 45km/h a crash WILL put you in hospital and any higher, you'll be in critical care or worse.
The problem is the little shops around that sell shit chinese scooters and ebikes as "offroad" bikes that can hit 60-70km/h , dont have proper regulators to protect the batteries from exploding on overcharge and either no speed govenor, or one that can be switched off with a convenient flip of the switch.
My GF's idiot brother recently got arrested doing 75km on a highway (ebikes are banned on highways) on an electric scooter. The cops confiscated him, charged him, and proceeded to confiscate and destroy the scooter. Now, the man is a raging idiot, but he was never actually told by the bike shop that riding this stupid thing was illegal, and he figured that as long as he had his driving license it was all legal. The police beg to differ and so did the judge.
Recently we had a Parlimentary enquiry into the things that recomended putting in restrictions on the import and sale of these 70km+ shitty vehicles as unlicensed motorbikes. And I fully support it, becuase if my collossal idiot brother in law hadn't been stopped by the police, chances are he would have been stopped by death. But it would have been better if he had been stopped by not actually being able to buy it at the local bike shop.