I wouldn't ban them, but I've witnessed some very careless riders on electric scooters. Situations evolve quickly these days so maybe some legislation on the hoof is required. Are they allowed on the pavement? that's where I've seen them. Also noticed a couple have come directly off the pavement on to the road without due caution. Like the "inconsiderate" bike riders, I'm only referring to the ones that don't obey the rules of the road, I've seen a couple whizz through red lights without a care in the world. I think it's only a matter of time before there will be a spate of accidents. I think bikes and scooters should have some sort of registration number and insurance. Considerable parts of the road are given over to cycle lanes these days, so maybe a lower level of road tax.
There's also a growing trend in my area for mothers of young children to have some chariot type of affair attached to their bike to ferry their little ones to and from nursery and school. These are really good in Center Parcs where they work well, but back in planet suburbia they can cause chaos and massive jams at rush hours. Quite often seen yuppy mum earnestly cycling away with a mile of vehicles stacked up behind her....and all those car fumes that the small children in these contraptions are exposed to
I'm not saying I'd ban them but they are highly impractical in metropolitan areas.