I see evo-psych cited a lot in TRP, but the hypotheses in this disclipline are tantamount to mental masturbation.

It's impossible for a hypothesis to become a scientific theory, and any falsifiability depends upon someone ''disproving'' speculation with slightly less unprovable mental masturbation.

Similar comments apply to conjecture about the causes and reasons for the prevalence of physical traits which developed in human and animal populations.

For example, I read a hypothesis from supposed ''scientists'' that suggested that the ancestors of the Scandinavians developed blonde hair because it made them stand out from the crowd in cold, white environments, when they were covered in black/Brown animal skin coats.

This ''hypothesis'' is clearly something which they pulled out of their arse. What evidence could support the claim? What evidence could falsify it?

Short of inventing a time machine, then we will never have a scientific answer to questions which relate to Evolutionary Biology.