An example: I am not a Marxist. But I think the Marxist question of "surplus value" as an ethical question is relevant and interesting. I pointed it out on HN a few times. Again, without being a Marxist, just intellectually curious. Nobody ever asks me if I am really a Marxist. I get downvoted pretty severely when I point it out. I get an impression that they smell a whiff of the opposing sports team and turn negative.