I agree that doing a bunch of research to decide whether or not you agree with an author before reading his works is silly, but at the same time, if you are mad

I agree that doing a bunch of research to decide whether or not you agree with an author before reading his works is silly, but at the same time, if you are made aware of them, there's nothing wrong with letting that determine whether or not you want to support the person by purchasing their works. In the case of Card, he unfortunately has put his position in some of the books. It can be rather subtle, but there was definitely an example of it in Ender's Shadow.