Snapedom

Children bump into tables and bookcases and chests all the time. Some times something gets knocked over and broken. That's the nature of childhood and no one would dream of shouting child abuse/neglect if a child while running through their home did something like that as a one off. As I said earlier my niece used to miss the dog by inches with her walker when she was under a year old. And yes I am using that as a comparable item to a toy flying broom. Do I think she would have killed the dog if she had bumped into it, of course not. She wouldn't even have hurt him. We actually see these brooms in action in the scene for GOF at the Quidditch World cup. The children on them have their feet just about an inch off the ground and the brooms are going real slow. It doesn't help your point to exaggerate the dangers to a magical child. As these toys would seem to be popular in the WW, I would put them in the same class as tricycles and such from our world. Children do get injured, that's a fact but to infer that Lily is neglectful for letting her magical son ride a toy is pushing your point into the outer edges of reason. We can critique the characters, their humanity and their interactions, but it is an exercise in futility to critique the reality of their world as it has been created. Some things we just have to take as their reality. Flying toy brooms is part of that reality just as waving a wand to fix a broken bone is.