Zacked Future
The Industrial Revolution had the effect of allowing many billions of people who would have died to stay alive — this meant that genetic mutations which would have been eliminated by death during childhood instead accumulated. […] … on the one hand mutations have been accumulating, generation upon generation, with (approx) one or two deleterious mutations being added to each lineage with each generation; on the other hand, people who exhibited traits caused by deleterious mutations — such as lowered intelligence and impaired long-termist conscientiousness, or higher impulsivity, aggression and criminality — were positively selected, were genetically favoured — simply because their pathologies meant they were either unable or unwilling to use fertility-regulating technologies. […] In other words, accumulating mutations which damaged functionality actually amplify reproductive success under present conditions and for the past several generations.