I was afraid someone would call me on that, lol. OK, I don't have data to back it up, but you know if I go looking I will find it. Besides, just because I simply asserted it doesn't mean that it isn't a fact.
Right. It isn't a fact, not because you asserted it, but because it is untrue. I think it may be possible that something is true despite you believing it
This happened to be something I checked out quite extensively some time ago, as I was discussing these issues with scholars who study media and pedagogics. The conclusions: Children can, from a very early date, clearly distinguish fact from fantasy, and make quite good value calls based the reality of both. Long time before they can come close to understanding Eminem lyrics, at any rate. Parents sometimes think this is not the case, since children have a very active imagination, but they almost always know the difference.
The exception to this rule is children who suffer from what was called MBD. This is, as I understand, a grab bag for some different behavorial problems in some children, that also may hamper socializing and adapting to society generally. Such children can e.g. take a Tom & Jerry cartoon seriously. They are also sure to increase the workload of parents and teachers considerably.
Whatever parents may do to limit what their children are exposed to, is of course up to them. I doubt anyone would argue a totally uncensored environment is suitable for underage children. Yet, I still hope that nobody will seriously argue that the adult world be censored to a degree that nothing but material suitable for young children is available to anyone.
"Common sense is the collection of prejudices acquired by age eighteen"
-- Albert Einstein