Perhaps they just don't care enough? I got unsupervised internet access when I was 10 and I don't see what's wrong with that. Similarly, video games didn't make me a psycho.
If in a few more years, “video games” evolve into hyper realistic VR worlds with LLM-powered NPCs that act like real people, also designed to maximize engagement, we might need to revisit the risks of exposing kids to that as well.