At a more general level, the international system is returning to great power security competition, now that multipolarity is replacing the post-Cold War unipolar moment, and how that future will turn
out is uncertain — but one thing that the last 67 years have shown is that
nuclear deterrence is a fairly effective way of stopping major power security tension turning into all -
out conventional war.
Earlier titles or spinoffs like Metal Gear Solid: Peace Walker dealt with the ethics of
nuclear deterrence — or more specifically, whether
nuclear deterrence could work without a human element to guide it (the debate being that, a human could always make the decision not to retaliate to a
nuclear strike,
out of fear of completely wiping
out the human race, as opposed to an A.I., that would retaliate regardless).