I would slightly agree that parents that train their kids on training wheels should maybe select a better place than a trafficked bike lane, but I for one is not going to stop them and tell them how to raise their kids. I would definitively not call the police and social service. I would be much more concern seeing the same behavior on the road, and if they were on the highway I would consider it.
> I think they are not allowed but they don't care. Electric or benzin engine alike.
Mopedists are what they are, or rather young adults without a driving license will behave like they always have. Motorized teens. Of course some of them will break the law. Modified electric bikes are however fairly rare since moped strength engines are generally more expensive, and if you are paying that much already then the moped license is fairly cheap to get. Modified mopeds however that goes faster than 45 km/h are very common, especially the four-wheel ones. The legal age to get a driving license is 18 so there is also a incentive to break the law for those that are around 15-18.
> Mopeds are not allowed where I live to use bike lane
Welcome to Sweden I guess… I think they are not allowed but they don't care. Electric or benzin engine alike.