> But it is less costly for the cities to remove the problem
It does not remove the problem but would simply transfer it elsewhere. In result, either people become significantly less mobile, or they get more used to cars, creating huge traffic jams and polluting cities with noise and fumes.
With scooter, one can get to any point of the city in 15 minutes max and basically for free compared to taxi. It has a huge value for the city economy, and worth the regulators' time.
> tourists who will bring back home a bad souvenir of their trip if they get fined
If you are caught for the first time, you'll just get a warning. So not an issue for a tourist.
But it is less costly for the cities to remove the problem (ban e-scooter) that to hire people to chase bad e-scooter behavior. Especially if many users of those e-scooter are tourists who will bring back home a bad souvenir of their trip if they get fined.