It’s no doubt nice to “allow” or “pay attention to” conservative arguments. But I think Roth recognized the benefit of what the Heterodox Academy advocates: actual diversity of viewpoints among faculty, speakers and students for dynamic interaction, discussion and testing of each other’s arguments. As John Stuart Mill said in the quote in #26, it is far better to hear and challenge an argument from one who really believes it than from a teacher who presents it together with the teacher’s own refutation.