Will our civilization, the noblest and mightiest mankind has ever seen, uphold the heritage of Jefferson and Locke, Milton and Voltaire, the unfettered contest for truth? Or are we headed for something out of Orwell, where certain words and ideas are banned in ostensible service of the common good? This was the haunting question when free-speech defenders from three countries teamed up to oppose thought control and advocate genuinely open dialogue in the public square, last week at a 58-nation conference in Warsaw, Poland…