I hadn't read about this case before, and after some quick reading I frankly find myself disagreeing with most if not all of Yarvin's political views and perhap

I hadn't read about this case before, and after some quick reading I frankly find myself disagreeing with most if not all of Yarvin's political views and perhaps even doubting that I would like to hear him speak. But in my opinion, personal convictions are irrelevant in technical talks, and any presenter with any modicum of professionalism would do well to keep the two as separated as possible, especially in this type of setting. In the case of an expert presenting research or some such in their capacity as an expert, I don't care (nor should I know) what their personal politics are (as long as they don't overlap with the topic at hand) - precisely because there is a danger of biases running amok. In addition, as others have already mentioned: whatever the organizers should do depends on their motivations and goals. Work and worker are not inextricably linked, nor do they necessarily reflect upon each other. There are plenty of examples of people that have accomplished major achievements in some fields while being perfectly irrational and/or plainly mean in others. Examples include: -John Lennon (wife-beater) -Tim Hunt (sexist) -James Watson (racist) -Luc Montagnier (anti-vaccer) -Knut Hamsun and Martin Heidegger (known and argued nazi sympathizers, respectively) -Steve Jobs (asshole), arguably Some of these are Nobel laureates. Their work isn't any less great because it was performed by jerks. There are, of course, cases to be made for boycotting certain products and presentations (by certain people with certain attitudes, performing certain actions or with certain ties), but if the conference's ultimate goal is to disseminate knowledge I think the choice should be left up to the audience. I guess you could try to weigh how much damage the rescinding of his invitation does to his (unrelated) cause vs. how much damage is done to the community by denying him to spread his knowledge through this arena, though this would likely depend on a host of personal variables.