Presumed Lost:
I understand your thinking, but you have to admit (The recent hurricanes being a prime example.) that people have and will come together in a genuine emergency.
Yes, some will panic and demand more and attempt to start a riot, but you throw them out with nothing and the majority will back you as long as you are fair. Also, remember I said an autocratic entity, so voting is not an option, only fair treatment for all.
From my earlier post, those with gastric bypass surgeries could argue they need more calories to sustain life, but that would threaten the common good of the majority.
Bountyhunter