Palmer Luckey hasn't ever publically stated any support for any such policies; people can support Trump without supporting those policies. As for Twitter, I don't think Palmer has ever given a single disparaging remark about those groups of people. You're mixing him up with his girlfriend.
Having said that, I separate the art from the artist. In the past, for example, Orson Scott Card has said sone pretty bad things, but I still love his books. Walt Disney was not a good guy, I still watch Disney movies and plan to go to Disneyland. In this case, supporting or buying the Rift isn't really supporting Palmer Luckey, since he sold the company to Facebook. He got his money already, Facebook gets all the profits.