Adding my own anecdote: Minneapolis has tons of electric scooters and has done a nice job of providing infrastructure (dedicated parking, expanded bike lanes, etc), especially downtown. There’s also plenty of signage reminding people that they aren’t allowed on sidewalks. Despite all of that, there are tons of people riding recklessly through crosswalks, on sidewalks, etc, on top of the usual problem of scooters being scattered all over the sidewalk and blocking pedestrian traffic. The problem isn’t with scooters, or even necessarily with the reckless operators - it’s the complete lack of enforcement of the rules. People are going to do what’s most convenient, even if it’s dangerous, even if it’s technically prohibited, unless there are consequences.