The conventionally proposed solutions to problems of altruism, ‘such as inclusive fitness/kin selection and various types of reciprocal benefit’ answer a different question, namely, why altruism, once established, is advantageous and worth sustaining, not how it came into being in the first place.
McGilchrist argues that evolutionary accounts of altruism address only its maintenance, not its genesis, and locates its deepest roots in the cellular self-sacrifice built into multicellular organisms.
, The Matter With Things: Our Brains, Our Delusions and the Unmaking of the World, 2021thesis