“The problematic question you then have to answer is: upon what basis can we declare any action RIGHT or WRONG?”
How does the non-evolutionary answer resolve this question? It seems the evolutionary answer is that we call something wrong that harms the individual or group and something else right because it promotes the individual or group. For example, feeding substance X to children is bad because it kills them. But for some aliens feeding them substance X maybe be good because it nourishes them.