s someone who voted for Barack Obama twice, supported the Affordable Care Act, and could be persuaded to vote for the right kind of single-payer system, I've found the entire health-care debate over the past several months deeply depressing. That's no doubt why my first instinct was to cheer when reading a recent rant against the right from an editor at The Huffington Post. The transparently titled opinion column, "I Don't Know How to Explain to You That You Should Care About Other People," is a perfect expression of our political moment — in its utter exasperation at those on...