To be fair, the responsibility to not-kill lies squarely at the hands of SUV drivers.
SUV -> human/scooter collision is the only one that leads to fatalities.
Also remember, we have infrastructure for cars, but very little for pedestrians or cyclists. Cyclists don't want to be on the road. They're much rather be on grade-separated bike paths. I don't endorse cyclists on footpaths, but in a lot of cities it is legal if the road not have adequate bike infrastructure.
Similarly, if pedestrians are walking on a green, they should be able to be on their phones. I do not endorse that behavior, but it is not like they are responsible for coming under death machine driven by another driver.
Your comment appears to distribute the blame across all 3 people. But 1 of these is 2 orders of magnitude more to blame than the other 2.
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I do agree that any going at car speed (Motorized scooters, Lycra-clad racers) belong where cars are: the road. A helmet can only do so much if you face plant at 50 kmph.
Anything that can go above 30 kmph on a flat, belongs on a road.