The problem isn't really the electric scooters, its the selfish attitude of those who use them with little or no regard for others.
Recently in two Spanish Cities, Barcelona and Girona, with quite a few micro-scooters being used and very little conflict between users of different modes of transport. Granted, both have reasonably extensive cycle paths and segregated routes, but even where scooters and pedestrians were co-existing, there was little issue. In fact, even car drivers were noticeably less aggressive and were considerate of other road users.