Leonid Bershidsky: One risk factor for hate crimes: A shortage of women

One often hears from people with far-right views that immigrants are a threat to "our women." Now, there's empirical confirmation that perceived competition for female attention is a key factor behind anti-immigrant hate crime.Rafaela Dancygier, Naoki Egami and Amaney Jamal from Princeton University and Ramona Rischke from Humboldt University in Berlin have published a paper in which they mapped German hate crime statistics onto the country's mating market. They found the incidence of hate crime