Does one more diatribe against Israel published by The New York Times matter? In recent years, the Times has had an open-door policy for those who oppose not just the policies of the Israeli government but also the whole idea of a Jewish state. So the publication last week of a piece by Atlantic columnist Peter Beinart explaining “Why I No Longer Believe in a Jewish State” — and opting for a single nation of both Arabs and Jews, instead of a two-state solution — didn’t really break new ground. What’s important, though, about Beinart’s decision to switch from self-proclaimed...