When I was in college, I read a book by George Gilder, one of the wisest thinkers of the last half-century, titled “Naked Nomads,” which had a deep impact on me. It was about single men and all the pathologies associated with them. For example, Gilder drove home the point that the biggest factor concerning violent crime was that it is overwhelmingly committed by single men. While there was no danger — I would say no chance — that I would commit a violent crime (though I was, at the time, single), this fact along with others in the book...