Re: Enough of evolutionary psychology. Where's your proof?
Two tenets of the theory of evolution are that 1) all living things are related to each other (i.e., have a shared ancestry) and, 2) ancestor-descendent lineages accumulate changes over time (i.e., evolve away from their starting point). Predictions that arises from these tenets are that some species should be more similar to each other (in terms of morphology) than they are to others. Furthermore, they should be more similar at the genetic level - not only when considering genes that affect their morphology (that might be considered circular), but also at genetic loci that have no morphological effects. When we collect data to test these predictions, we find that they are correct.
This is not hypothetical. These are "facts" that support the theory of evolution.