  Furthermore, it would seem that much “deeper” explanations of these behavioral tendencies are available. Most obviously, there is an evolutionary account available, which explains parental investment in terms of inclusive fitness (and also explains “new mate infanticide” in terms of sexual selection).  Because of this, proponents of methodological individualism are open to the charge that they are promoting half-way explanations, and that the evolutionary perspective offers rock-bottom ones. More generally, any theory that purports to explain the origin of our intentional states in terms of deeper underlying causes, or that claims to explain much of human behavior without reference to intentional states (such as Freudianism, which treats many of our beliefs as rationalizations, our desires as sublimations), will be unmoved by the methodological individualist’s demand that pride of place be assigned to explanations formulated at the action-theoretic level.