Life is, fortunately, not a continuous application of game theory. - J. L. Mackie

Hardly any part of anyone's conduct concerns only himself.

The happiness with which I am, inevitably, most concerned is my own, and next that of those who are in some way closely related to me. Indeed, for any reasonably benevolent person these cannot be separated: he will find much of his own happiness in the happiness of those for whom he cares, or in what he and they do together, where the enjoyment of each contributes so essentially to that of the other(s) that it will be more natural to say 'We had a good...' (whatever it was) than to speak of a mere sum of individual enjoyments.

Does the right of a nation as it is at present to its territory include the right to forbid or to limit immigration, or to deny full citizenship to immigrants and even to the locally born children of immigrants? Obviously this raises the question just what is to count over time as the same nation.