A common critique in all behavioral science is that most of it can be distilled down into telling the better story through weak or nonexistent evidence, and thus the only "real" way to conduct science into behavior is to use more hard evidence like genetics, neuroscience or even more concrete such as fossil records.

The problem is that the probability to finding a "gaming" gene, one that only exist or be expressed in males, would be very unlikely.

Robert Sapolsky has a good description of this in his lecture series "Human Behavioral Biology" (https://www.youtube.com/watch?v=NNnIGh9g6fA&list=PL848F2368C...).