Earlier quoted context omitted.
evo-psych needs studies? It seems more that the armchair evo-psych people have just decided on a set of axioms beforehand that sound sufficiently "common sense" and are making deductions based on that.
Evo-* people have always pretty much relied on "just-so" stories. Evolutionary biologists who claim that feathers evolved from scales by snakes jumping off trees for millions of years are falling into the same trap.
I recommend you broaden your understanding of science. Scientific hypotheses are always one iteration in a series of increasingly accurate models of the known universe. Evolution, being a very young science, is understandably very far behind Physics in its life cycle. This does not mean that all evolutionary theory is "nonsense" because it cannot be instantly falsified with a perfectly designed experiment in real time.
The beauty of evolution, just like any other law of the universe, is that it does not care much for one's disbelief.