Highlights

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the paradox of tolerance: Unlimited tolerance must lead to the disappearance of tolerance. If we extend unlimited tolerance even to those who are intolerant, if we are not prepared to defend a tolerant society against the onslaught of the intolerant, then the tolerant will be destroyed, and tolerance with them.

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one of the the best strategies is called generous tit-for-tat. Playing a generous tit-for-tat strategy means cooperating on the first move and then mirroring whatever the other player did on their previous move — but, crucially, occasionally cooperating after an attack as a opening to potential future collaboration. So, if the other party cooperates, so do you. And if the other party attacks, attack back…but not every time. Attempting to collaborate in the face of repeated attack leaves the door open to reestablish a virtuous cooperation cycle.