Earlier quoted context omitted.
Another possibility, discussed at depth in Freakonomics , is that reducing unwanted children reduced crime rates. There is some controversy about this, but it may be one of the factors: https://en.wikipedia.org/wiki/Legalized_abortion_and_crime_e...
Yeah, but given choice, I will go for scientific explanation and for what sociologists say then for pop book that was not even peer reviewed.
https://academic.oup.com/qje/article-abstract/116/2/379/1904...
https://law.stanford.edu/publications/the-impact-of-legalize...