If you poll people, almost everyone thinks things should be more fair -- to the point that some are nearing violence over the issue. I think it's quite unnatural for things to be this unfair, and requires elaborate orchestration to keep it so.
I also don't think the idea was a principled attempt to model the situation -- I think it was a post-hoc justification for why it should be as we see, and not an actual attempt to explain why things as they are. Nobody raises "well, it's just natural" for why we shouldn't try to stop heart attacks (and particularly, I've never heard it for why we shouldn't try to reduce the number of heart attacks, as it was used here about unfairness) -- only things like equality, gay marriage, etc. Which happen to all be things that align with the speakers' beliefs (either for or against; I've heard it both ways).