Dude. 3 child abductions per year.... 3 out of 300,000,000? There are just over 300 million people in the U.S. but there weren't 300,000,000 abductions last year... If you start out with these kinds of mismatched statistical comparisons then how can we accept your statistical analysis of 1972 compared to today?
3 child abductions by strangers out of a population of 300,000,000 people. In other words, a statistical non-event.