There are plenty of companies with generous return policies who don't support land closure. I can't remember the last time I bought something that I wound up needing to return, but I guess I just make sure I know what I want with absolute certainty before I spend any money.
In my opinion, REI's land-closure stance is a much bigger "negative" than is the "positive" of their return policy. I'd never buy something from REI even if they were the only source on Earth for it - there's simply nothing I need badly enough that justifies backstabbing the efforts of Blueribbon Coalition, UFWDA, ARRA, CORVA, COHVCO, USA-All, and every other shared-access organization that's out there fighting to keep public lands open for ALL forms of responsible recreation from the closure efforts of a few elitists.
In my mind, the anti-access groups' efforts to exclude 4-wheelers from public lands is akin to excluding women, or excluding Blacks, or excluding children, or discriminating against any other group for no good reason. Public lands are for ALL of the public to enjoy, and until REI, the Sierra Club, the Center for Biological Diversity, and every other anti-access understands that, they can go **** themselves. We're not destroying public lands! We're the ones who are out there volunteering our time and resources working side-by-side with the Forest Service and BLM on resource management projects because we are the TRUE environmentalists. We don't just sit there in our armchairs and write checks to the "environmental" organizations so that we feel good about ourselves - we're the ones who live, work, and recreate in our public lands and depend on present and future environmental health and public accessibility.