I just discovered this study ( although it's a few years old, but i never heard of it ).
********papers.ssrn.com/sol3/papers.cfm?abstract_id=174508
Basically in short it argues that the main reason for a dramatic drop in crime in US that started in the 90ies is legalization of abortion.
That future criminals were just not born.

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Человек, который почувствовал ветер перемен, должен построить не щит от ветра, а ветряную мельницу