Metal Gear Solid: Revolver Ocelot Explained
Do You See This, Zero? We Are Victorious! Behold, Guns of the Patriots!
Well, despite this being a Metal Gear Solid game, no. Some would like to say it's not as far-fetched, but it's just a different kind of far-fetched. Bear with us, here.
It turns out, at the end of the game, that it isn't Liquid's arm at all but a cybernetic prosthesis. The whole "Liquid persona" was a ruse, a front that Ocelot had been hypnotised to believe in order to dupe the stringent security measures behind the Patriots' "Sons of the Patriots" AI system. Hence the plan to use Big Boss' remains (later revealed to have been Solidus') to bypass it.
Ocelot had put himself through a complete persona change to not govern the world against the Patriots, but to stop them from doing that themselves.
But to say themselves, in regards to the Patriots, would be a stretch. There's no human element to them anymore, merely an AI that grossly misinterpreted the will set out by the Boss in the first place. Zero saw this coming and retreated, before being rendered catatonic by Skullface. Big Boss' phantom saw it too, under the guidance of Ocelot, since the events of the first Outer Heaven in the 90's (the first Metal Gear game).
So now, we're starting to see the bigger picture unfold: Ocelot, despite being raised into a world of duplicity, double-crossing and espionage, has had enough of the imposed rule of an overlord-like system, and seeks to break free.
Though he may have finally been beaten by Old Snake atop his Outer Haven, his goal is finally achieved. The Patriots' AI has been overthrown, perhaps not how he'd imagined, as his plan was to nuke the orbiting AI satellite. Finally happy in the knowledge that it's over, he drops the Liquid persona before thanking Snake and accepting his fate.
So, why go through all the lengths of hypnosis, deception and fifty-odd years of compliance just to have someone else wipe them out...?