There's a lot to be said for separating the art from the artist (Heidegger always comes to mind). That being said, if the art is an expression of the ideas that are considered reprehensible, then it becomes much harder.

With the example of Heidegger, his core works, including Being and Time, did not expound upon his Nazi sympathies. Had Being and Time instead be a work which deeply integrated Nazi ideology, the dialog around the work would be significantly different. Instead, a clean line can be drawn between Heidegger the Nazi, and Heidegger's work.

With Yarvin on the other hand, his work actually expounds upon the ideology he created. There's no clear way to draw a line between Yarvin's ideology, and Yarvin's software, since they're so deeply linked.