The fact that it doesn't bother anyone. If I were a parent I'm pretty sure I'd be horrified.
The thing that makes it make even less sense in the book is that the population of the world (with the exception of the clever main characters who know what is happening because they have, by author fiat, chosen to believe the correct mish-mash of end times prophecy)
doesn't know what caused the disappearances.
We (the readers) know that the children (and everyone who was "worthy") have been raptured and taken to heaven, because we can read the book jacket. But in the book, no one knows what happened to them - which is the story that "Buck" is supposedly investigating at a leisurely pace so that
Global Weekly can get a story out "in three weeks or so" (imagine that 2 billion people suddenly vanished, and
Time decided it would be worth a cover story about a month later).
Theories are handed about - aliens took them, electromagnetic feedback from too many technological devices and nuclear power vaporized them, and so on. So, most of the world (except our heroes, who know "the truth", but aren't bothering to tell anyone, because that would be unChristian of them or something) thinks that their children and other loved ones are dead. Or abducted by aliens. But no one seems to care. At all.
And not telling people news doesn't seem to be an exclusive feature of the virtuous heroes - several times the editors of
Global Weekly sit on a story that, if it actually happened, would normally be huge and splashed across the cover of every newspaper and magazine in the world. Like, say, we have solid evidence that the wealthiest banker in the world and the President of Romania (and soon to be secretary-General of the UN, which somehow leads him to being World Dictator too) have conspired to kill several people, including a London policeman.
Really, the book makes no sense. I think a decent book
could be made using the same subject matter. These books are not even worth the paper they are printed on.