ITN has made a documentary where they put two children in a crowded shopping centre and told them to pretend to be lost. One person helped them; six hundred did not. I gather that part of the reason people didn't stop was that they were worried someone would mistake them for a child molester.
You remember that in the Good Samaritan story, the priest and the Levite passed the injured man by because they were worried society would stigmatise them as ritually unclean if they touched a corpse. And here, people ignore lost children because they're worried society will stigmatise them as dangerous perverts if they talk to stranger children.
(FWIW, I decided a long time ago that I would *always* question unaccompanied children despite any risk of misinterpretation by others.)
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