When you’re having dinner with your in-laws, graciously downplaying disagreements about politics and religion is the thing to do, for such discussions usually lead nowhere and often engender bad feelings. It should be different, however, among people who make their living by speaking and writing about issues of public concern, among professors and pundits and politicians. These people voluntarily enter the public square in order to contribute to the common good by persuading their fellow citizens about what that good really is. There are important things at stake here—with abortion, for example, the issue really is one of life and death—and so it’s absurd to say that we should minimize our differences or agree to disagree or fail to bring forward our best and toughest arguments against our opponents lest we hurt their feelings. Quite the contrary, we should state as clearly as possible what we think and why we think it—including why we think our opponents are wrong. We owe this to the public we are seeking to persuade and even to our opponents themselves, for, as Aristotle says, in philosophy we must love the truth more than our friends.