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There seems to be Kantian maxim lurking here: "Cooperate with people who cooperate".
There is a recursive whiff to that, and that's one of the keys to human interaction. Actually, a more precise formulation of this "cooperative principle" (pace Grice) is even more recursive:
"Cooperate with people
who cooperate with people
who cooperate with you".
Because our enemies, rivals and adversaries also cooperate with one another, and that doesn't make them or their projects more morally desirable for us, or more cooperative in the right and proper sense. That's what Kant did not get at all.