A particular dark triumph of modern nationalism has been its ability to persuade citizens to sacrifice their lives for a political vision forged by emotional ties to a common identity. Both men and women can respond to nationalistic calls to fight that portray muscular warriors defending their nation against an easily recognizable enemy. This “us versus them” mentality can be seen in sectarian violence between Hindus and Muslims, Tamils and Sinhalas, Serbs and Kosovars, and...