We don't ban cars or motorbikes because they're unsafe. We require a license and insurance then ban those who repeatedly break the rules of the road.

We need to find a sensible way to regulate these bikes, which may involve some sort of license, insurance, and mandatory helmets. But it needs to be less costly/more convenient than getting a petrol motorbike (or car) if we want people choosing the more eco-friendly option.

Cycling enthusiasts don't tend to consider those who are far less fit/healthy/young when they push the pure-human-powered option.

I think the parent is talking about banning them specifically in pedestrians and cycling lanes. We currently ban motorcycles and cars from using them, presumably because it’s dangerous to pedestrians.