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This is data from 2019 so prior to the hire scooter schemes. Given the relative similarities weight, speed and use of scooters to cycles I don't think it's unfair to make assumptions that scooters would show up similarly small in the stats. 65% of pedestrian deaths involved a car, 1% involved cycles so assumption here is that scooters will be similar - way less of a danger to pedestrians than cars.
Drivers don't treat pavements with respect but I agree that outside of some specific places they don't use them like some scooter riders and cyclists do, but all the rest come on... drivers always speed (actually about
50% of them in 30mph roads), on their phones not paying attention, kids in the back arguing and distracting them, never give way to pedestrians crossing side roads, close passing cyclists etc etc etc... but of course in that 1-2ton car you are way more of a danger to other people. And if you look through that report you'll see just how dangerous car drivers are to other road users, and just how slight the danger to other road users is from cyclists (and by extension, scooters) by comparison.
e2a to answer your main point - people have to travel some way. The attitude someone has when travelling is going to define the attitude they take to other people. Infrastructure influences decisions (I don't think many of them would be on the pavement if there was a safe cycle/scooter lane to use) but you can ride on the pavement in a safe and respectful manner, or in a shitty dangerous manner, and that's entirely down to the person riding. Same on the road, you can travel in a safe manner or in a dangerous one and that's down to the person. A shitty, selfish, dangerous scooter rider doesn't suddenly become a good, attentative, generous driver.