Isn’t it a little odd that our most cherished Christmas film is about a man seeking to end his life by jumping off a bridge? Frank Capra’s It’s a Wonderful Life is full of traditional holiday themes like romance, friendship, and family. It’s unabashedly sentimental too—“Capra-corn” in its purest form. But it’s also a film about suicide—its causes, costs, and consequences.

The movie’s dramatic arc is built around 40-year-old George Bailey’s attempt to kill himself. The film opens with prayers offered …