A recent terrorist attack in Toronto, which left 10 people dead, has brought global attention to the “incel” movement, which stands for “involuntarily celibate.” The term refers to a growing number of people, particularly young men, who feel shut out of any possibility for romance, and have formed a community based around mourning their celibacy, supporting each other, and, in some cases, stoking a culture of impotent bitterness and rage at the wider world. In a few cases, this rage h...