Actually, the closest I've come to colliding with someone doing this shit is when I was riding my bike - on the correct side of the road - and suddenly encountered a cyclist (a mom towing her two kids on a trailer, no less) head-on coming the wrong way around a blind turn. I was barely able to avoid hitting her; if I'd been in a car going 25 mph I almost certainly would have hit her.
It's just fucking stupid because it's contrary to other drivers' (and cyclists') expectations and gives them virtually no chance of avoiding the situation or reacting correctly, and it also happens to be straight-up illegal.
Unsafe behavior isn't made okay just because the risk of death is minimal. The mother could have been concussed or had a broken bone, for all we know. If things go pear shaped and the trailer tips over, you could have the kids dumped out into traffic on one side, or down a ditch on the other, for all we know. This line of thinking, that it's okay as long as it's not equally dangerous as it would be in a car, makes no sense.
Sure, all other factors being equal, it would be less severe with everyone on bikes, but your initial post read rather dismissively to me. Rather than, "Well at least it wasn't a car and they didn't die," it came across to me like "Nobody was in a car and it was unlikely to kill them, so it's not a problem." Perhaps that wasn't your intent, but it's certainly how I interpreted it. We can advocate for a safer mode of transit while also calling out dangerous behavior by people using our preferred mode.
An old lady at the hospital I used to work at was killed by a bike rider crashing into her at a high rate of speed. She hit her head on the pavement & fell unconscious - person on the bike bailed, when she was found after a few minutes it was too late.
It is far easier to protect pedestrians from 4-wheeled vehicles with simple measures such as concrete bollards and fences, but a 2-wheeled vehicle can go basically anywhere a pedestrian can, and now with EVs they can do it way faster without much effort.
Momentum is the biggest factor in the severity of the crash, and an ebike is never going to have as much momentum as a car. Severe incidents can happen with bikes and they should be sensibly regulated, but it is far less common than crashes involving cars.