I don't think it's really that bad for kids to do this, nor for parents to let their kids do this. Obviously parents should supervise somewhat to make sure that the kids aren't being manipulated by some predator, but otherwise I think it's fine. The solution to "there are bad people in the world" isn't to shut out the world, it's to watch out for bad people.
Yeah, fair; I guess what I was getting at is that kids shouldn't do stuff like that unsupervised, especially really young kids. If it's just politely interacting with a singer, that's fine, but if the conversation gets too bad that can shut it down.
Completely agree, I think that's a very reasonable precaution that doesn't really "restrict" the kid, but hedges a bit against the famous person doing anything inappropriate. I also feel like nearly any famous person who isn't a creep would understand as well, within some degree of reason.