sure - that's fair. but you could say that about anything. but social commentary (whether you think it works or not) is built into Fallout's DNA (thanks, I suppose, to its IP handlers)… whereas you can't say the same thing about Halo.
my point is, there's not really any barrier to using the Halo universe to hold up a mirror to society. That's really what the role of many of the factions and support characters have in the novels, but for some reason aren't used that way in the show.