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Re:Hajnal line by dan-robertson on Sunday September 30, 2018 @06:12PM (#18108712)
If this is true and significant then it does not imply a long-term improvement so much as a specialisation towards (a) not being caught for crimes and (b) being able to become an “elite,” potentially by violence, cruelty, manipulation, and other traits one likely would not consider desirable.
Re:Hajnal line by rdl on Sunday September 30, 2018 @06:48PM (#18108875)
On crimes I disagree, because committing violent crimes and being caught for them tend to be fairly correlated; crime is rarely a one-time thing, and criminals get unlucky or are stupid too.

As for elites -> more children, since there were various routes into "elite" for smart/competent/etc. people (the church in various roles, not all of which precluded reproduction; skilled trades/guilds, etc.), it did have a positive effect in amplifying traits (intelligence, etc.) which I think people broadly support (I do). Similar to the assortative mating issues with colleges and elite workplaces today.