Crime rates were much higher back then and there were no cell phones or other easy communication devices that would allow the kid themselves or a random pedestrian or motorist to rapidly notify authorities if something is wrong.
The safer our society gets the more afraid we become and the less tolerant we seem to become of risk.
I wonder if it's a cognitive analog of the hygiene hypothesis for allergies. There's a part of our brain that is built for a world of conflict, danger, and scarcity and in an abundant modern developed nation it just has nothing to do but declare war on phantoms and crusade against minute or non-existent risks.
I've had debates with people recently about how bad crime is becoming and how dangerous things are. I show them graphs of crime and violence for the past 30 years. I often get total unironic disbelief -- as in they don't believe it and think the sources are biased and there's some kind of conspiracy to suppress the real statistics on crime. Things were much more dangerous in the 60s through the early 90s and people felt a lot safer.