The “straw man” prior expectation of the dominant social psychology paradigm is that humans should behave with perfect rationality and high ethical standards. The more modest claim of evolutionary psychologists is that humans have evolved specific adaptations for adaptive problems that were reliably present in the ancestral environment. Outside that restricted range of problems, one should not expect optimal behavior.
Behavioral and Brain Sciences
Figueredo, A. J., Landau, M. J., & Sefcek, J. A. (2004). Apes and angels: Adaptationism versus Panglossianism [Peer commentary on "Towards a balanced social psychology: Causes, consequences, and cures for the problem-seeking approach to social behavior and cognition," by J. I. Krueger & D. C. Funder]. Behavioral and Brain Sciences, 27(3), 334-335. https://doi.org/10.1017/S0140525X04290082