It is rooted in an a leftist ideology that has no regard for the principles of personal liberty, free speech, and the central role that secularism has played in all moral and political advancement in the west over the last 300 years. In fact, the very reality that any such advances have occurred are often denied.
Yes. And that is the exact opposite of classical liberalism. It flips it on its head. As Rubin says, we need to have the hard and deep conversations and keep open to all points, or we leave it open to easy (and wrong) answers, which are abundant on both sides.