I like the fact that, like Tolkien, many sci fi writers, Niven and Heinlein come to mind, have been on our side of the fence regarding political philosophy.
Other similar authors: James Hogan, who writes mostly hard sci-fi, has developed libertarian/conservative leanings. Asimov seemed to me to be a borderline case: his books had some very liberal leanings, and at other times were quite conservative... I just read John Ringo's alien invasion books a couple weeks ago and he seems pretty conservative - at least there was none of this qimpy "let's negotiate with the man-eating things" nonsense.
So I guess there's some hope yet in sci-fi. I haven't stopped reading it yet, anyway.