Have you considered the possibility that one of the kids learned this stuff from watching his father/uncle/next door neighbor or from having seen a sicko video that a relative might have on a computer or a DVD? If,by chance,*that's* the explanation do you *still* give them 30 years?
I’m sure that will be revealed, but there’s a tremendous amount of speculation there on your part. No such explanation is in evidence right now, so speculation about ‘what if’ is futile.