For the record, I still disagree, but can't be arsed to follow option a, b, or c. 
I'll try to say why in a very condensed way in order not to tempt you to write very long replies:
If you define "society" as all human interaction, then reciprocity is IMO no longer necessary to function in it.
Plus, reciprocity becomes moot because people's situations are never exactly the same.

I'll try to say why in a very condensed way in order not to tempt you to write very long replies:
If you define "society" as all human interaction, then reciprocity is IMO no longer necessary to function in it.
Plus, reciprocity becomes moot because people's situations are never exactly the same.
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