In the sentence, "Just governments ought to ensure food security to their citizens" does "their citizens" refer to all citizens of the just government, or just most citizens in general?
closed as off-topic by tchrist♦, Robusto, Ellie Kesselman, Misti, FumbleFingers Mar 2 '15 at 13:12
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It's a little odd to say "Just governments ought to do X." If they're truly just, surely they do what any government ought in justice to do. Therefore, a simpler expression of the underlying idea here is "Just governments do X," or more specifically,
Just governments ensure food security to their citizens.
Alternatively, you could express the much same notion of what is appropriate for governments to do by saying
Governments ought to ensure food security to their citizens.
where the implication of ought may be "in order to be just" (although it may instead mean something like "in order to be successful").
Absent some external qualifying modifier—and there isn't one here—"their citizens" encompasses everyone in their country except noncitizens.
As to how a just government treats resident noncitizens with regard to food security, the reader is left to speculate freely; the example sentence does not address that question.
Technically, "their" is a possessive, however the sentence would usually be understood in generality.