“There are truly only three situations in which debating someone on the left is worthwhile. First, you must: your grade depends on it, or your waiter threatens to spit in your food unless you tell him why same-sex marriage is a detriment to Western civilization. Second, you found an honest leftist actually willing to be convinced by solid argumentation. Congratulations! You found him. He actually wants to sit down and have an evidence-based conversation with you; you want to have an evidenced based conversation with him. Everything is just hunky dory! Then you ride off on your separate unicorns. Third, you should debate a leftist if there is an audience. The goal of the debate will not be to win over the leftist, or to convince him or her, or to be friends with him or her. That person already disagrees with you, and they’re not going to be convinced by your words of wisdom and your sparkling rhetorical flourishes. The goal will be to destroy the leftist in as public a way as is humanly possible.”