I guess a play on Jonathan Swift's 1729 A Modest Proposal For preventing the Children of Poor People From being a Burthen to Their Parents or Country, and For making them Beneficial to the Publick
And there's more than one culture that applied that rule to us.
And a number of pathological individuals within cultures that don't apply that rule to us.
Some people eat people. There was a guy who had a foot amputation and made it into taco's for his friends.