Robert Paul Wolff has an answer for us. Ready? The bolding is Wolff's own and is twice-repeated:
Is Professor Wolff serious? I'm afraid he is. But given that the man is neither stupid nor the usual sort of left-wing moral scumbag, how could he be serious? What explains a view so plainly delusional? How account for an emotion-driven mere dismissal of the conservative position the arguments for which he will not examine? How is it that a professional philosopher, indeed a very good one, can engage in such puerile ad hominem psychologizing? Wolff himself provides an answer in a later post:
My knowledge of the beliefs and sentiments of those on the right is based entirely on things I have read or have seen on television. I have never had a conversation with a committed right-wing opponent of the Affordable Care Act, nor have I even, to the best of my knowledge, met one. You would be quite correct in inferring that I live in a left-wing bubble [called Chapel Hill — before that, I lived in a left-wing bubble called Amherst, MA, and before that I lived in the right wing bubbles called Morningside Heights, Hyde Park, and Cambridge.] If this strikes you as disqualifying my from having an opinion, you are free to ignore the rest of this post.
Need I say more?