As much as it's uncomfortable to define fair, I'd argue that it behooves us to strain and come to a conclusion. Every societal problem today and in history can probably be attributed to people not wanting to define a global fair, or defining it in a way (at least in retrospect) that was ostensibly below the mark. I'm sure that at some points in the US history thought it's fair to treat some people as slaves, so does your proclaimed universal sentence stand there too?