I couldn’t care less if e-scooters gain more traction but I do care if a completely unprotected vehicle can go at speeds where either the driver/rider or a pedestrian can get killed or seriously injured in the event of an accident and those have already happened where I live, with a large proportion going towards recklessness of the driver/rider.
These vehicles have been recorded travelling down highways, criss-crossing traffic, cutting in front of busses, etc, often with very gory results for every part involved.