An asshole in a truck doesn’t mean they necessarily will drive their truck down the sidewalk like what is common with assholes on two wheels.

Not to defend irresponsible scooter use, but the 'but scooters are more commonly a hazard to pedestrians' argument could (and arguably should) be expanded to include trucks vs. cyclists.

I don't always have bad interactions with motorists, but when I do it's almost always some guy in a truck that feels entitled to drift over into the bike lane while I'm in it, or when there isn't a bike lane, to overtake dangerously- if I have one thing I feel threatened by when I ride my bike, it's not scooters, it's badly-behaving motorists but mostly men in trucks.

If we're going to use the 'I feel threatened by scooters when I am a pedestrian' measure to justify regulating them, what if I feel threatened by big truck drivers when I am a cyclist? Yeah this all ultimately boils down to inadequate infra so not everyone has a safe or appropriate place to be, and these are all real problems- it doesn't make sense to me to decide one of them ought not to be addressed.