Ancestrally, only a fraction of men reproduced (~40% vs. ~80% of women), typically those at the top of the hierarchy. This created intense evolutionary pressure for men to compete and achieve high status, as this was the primary way to attract mates and ensure genetic legacy.

The consistent pattern of men committing mass violence is rooted in biological evolution. Men are wired for aggression and physical confrontation, a trait historically selected for by women seeking protectors. This is a biological reality, not a surprising social anomaly.

For women, a safe strategy historically led to reproduction. For men, the odds were stacked against them, as most did not reproduce. Therefore, high-risk, high-reward behaviors evolved as a necessary gamble to achieve the status required for mating and avoid being a genetic dead end.

The loss of a male role model makes a boy more likely to be incarcerated than to graduate college. The same event has almost no statistical impact on a girl's life outcomes, highlighting boys' greater neurological and emotional vulnerability.

When asked to imagine incestuous acts, women's disgust is uniformly high. Men's responses show a much wider variance. This reflects the catastrophic evolutionary cost of a single bad reproductive choice for a female (nine months of gestation) versus the far lower opportunity cost for a male.

As women's success grows, their preference to "date up and across" creates an imbalanced sex ratio at the top of the socioeconomic ladder. This gives a small group of ultra-high-performing men disproportionate power, leading them to be less committal.

People tend to marry and befriend those who are genetically similar, a process that amplifies genetic inequality in the next generation. This is compounded by geographic sorting, where individuals with genetic propensities for success migrate away from disadvantaged areas, leaving them 'doubly disadvantaged, genetically and environmentally.'

Societies leverage men's greater expendability (from a reproductive standpoint) and their innate inclination to create large, complex systems like governments, armies, and economies. This exploitation, while harsh, drives cultural competition and progress throughout history.

Men's higher tolerance for risk makes them more likely to take massive bets to accumulate wealth. Conversely, women's typically more developed risk-assessment skills make them better at preserving that wealth, suggesting a powerful dynamic for married couples.