Why does San Francisco now have fewer children per capita than any of America's largest 100 cities? An anonymous reader writes:So is this part of a larger trend -- or something unique about San Francisco? The New York Times also quotes Richard Florida, author of The Rise of the Creative Class, who believes technology workers are putting off families when they move to the Silicon Valley area because they anticipate long working hours. There's also complaints about San Francisco's public school system -- 30% of its children now attend private schools, the highest percentage of any large American city. But according to the article, Peter Thiel believes that San Francisco is just "structurally hostile to families."