The Effect of Altruism at Current Margins

At current margins, I'm fully on board with what you might call the EA algorithm. But at the same time, I don't accept it as a fully triumphant philosophic principle that can be applied quite generally across the board or as we economists would say inframargently. Let me just give you a simple example. If aliens were invading the earth and they were going to take us over in some way enslave us or kill us and turn over all of our resources to their own ends,. Would you fight on our side or would you first sit down and make a calculation as to whether the aliens would be happier using those resources than we would be? That's an actual psychological fact.