Some scooters are susceptible to death wobble, that's true. The fact that you can push a bicycle without a rider and it will roll, while most small-wheeled kic

Some scooters are susceptible to death wobble, that's true. The fact that you can push a bicycle without a rider and it will roll, while most small-wheeled kick-scooters will fall, is not caused by a higher center of mass, but by the geometry of the front wheel, mainly the steering angle, fork offset and trail. Without a rider, a) the center of mass isn't even that different and b) it doesn't really matter how they behave without one, because the rider is part of the system.