Psychological Altruism (PA) is the view that everyone, ultimately, acts altruistically all the time. I defend PA by showing strong prima facie support, and show how a reinterpretive strategy against supposed counterexamples is successful. I go on to show how PA can be argued for in ways which exactly mirror the arguments for an opposing view, Psychological Egoism. This shows that the case for PA is at least as plausible as PE. Since the case for PA is not plausible, neither (...) is that for PE. (shrink)