At least since Sidgwick (1907: 434), many utilitarians have taken for granted that human nature is such that the real possibilities are (1) that human beings care passionately about some and less about each of the rest of humanity or (2) that human beings care weakly but impartially about everyone. In other words, what is not a realistic possibility, according to this view of human nature, is human beings’ caring strongly and impartially about everyone in the world. If this view is correct, then one enormous cost of successfully making people completely impartial is that doing so would leave them with only weak concerns.