Comment by DC1350

Economic equality means women don't need to pair up with men for utility reasons anymore, which means a lot of men will be leftovers since this has historically made up a huge chunk of all marriages. Polygamy or at least polyamory follows since sexual and emotional needs are better met by one man to many women pairings. This is very easy since online dating creates a super efficient market where most women have hundreds of options and most men have very few. Unmarried and sexually frustrated young men are generally unsatisfied with life and prone to engage in antisocial activity.