Yes. It is common sense. Carlie's mother said that her daughter would do everything possible to get away from Smith. I believe her, but common sense to me is that a child against planned out pure evil in an adult is an unequal struggle. It looks like he tried at least once before to kidnap a woman, and failed, and so decided to use his "great with kids" skills to single out a victim he could succeed with.
Sure it is, but you can help equalize it a bit with many of these things. Many of these abductions take place in plain view of other adults who just don't notice because the perp convinces the kid to be quiet, probably by threatening them or telling them they'll hurt their parents if the kid makes a noise or whatever. The core thing I always stressed was to fight and make noise no matter WHAT the adult said, no matter WHAT the adult offered, no matter WHAT the adult threatened, no matter WHO the adult was or claimed to be or appeared to be. I believe the odds greatly improve for the child if you can truly get that point to register.
It can be incredibly hard to get that point REALLY ingrained, though. I saw a hidden-camera show in which, with parents watching (unknown to the child) and constantly assuring the interviewer that there was NO way their child would go with a stranger, time after time the child would quietly and almost immediately go with the stranger. It was one of the most frightening things I ever saw on TV.
MM