Quote from The Economist cover story on Gendericide
Gendercide: The worldwide war on baby girls | The Economist
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Throughout human history, young men have been responsible for the vast preponderance of crime and violence—especially single men in countries where status and social acceptance depend on being married and having children, as it does in China and India.
A rising population of frustrated single men spells trouble. The crime rate has almost doubled in China during the past 20 years of rising sex ratios, with stories abounding of bride abduction, the trafficking of women, rape and prostitution.
A study into whether these things were connected† concluded that they were, and that higher sex ratios accounted for about one-seventh of the rise in crime. In India, too, there is a correlation between provincial crime rates and sex ratios. In “Bare Branches”
††, Valerie Hudson and Andrea den Boer gave warning that the social problems of biased sex ratios would lead to more authoritarian policing. Governments, they say, “must decrease the threat to society posed by these young men. Increased authoritarianism in an effort to crack down on crime, gangs, smuggling and so forth can be one result.”"