[sghodas]

There's an interesting (although controversial) correlation between legalized abortion and decline in crime for that time period. https://en.wikipedia.org/wiki/Legalized_abortion_and_crime_e...

[hga]

Few if any things correlate better with crime than the population of young men.

Not that any but a 1st half of the 20th Century progressive would be happy with the possible mechanism you mention.