The kidnapping is just an extreme permutation; more likely (and equally horrendous) scenarios are death by fire or even misadventure (e.g. child drinking bleach from under the sink).
I understand it is difficult to find someone trustworthy (believe me, I had to personally look after two cats for seven years because no one else would EVER be suitable), but that doesn't mean it's okay to abnegate one's responsibilities.
I'm not blaming the parents for the situation, however, just making an additional assessment.
I feel for the parents; they will never forgive themselves.