At best, an action might be said to have the value of its consequent. So actions that produce a moral consequent may have a positive moral value. Sorry, I was remiss in one point. My example of the survival of mankind being a universal ethic was simply intended as an example. I did not intend to assert that it was, in fact, a universal truth.
Morality is a subjective judgement.
This may not be precisely measurable by any given person, but I never said it could. The 'value of the consequent', however CAN be measured on a cosmic scale - by simply observing how well the species survives. My claims that you are wrong are my own opinion. My claims that you can't be sure if you are right is based on the vastness of the universe, and areas of even mundane knowledge which we don't have acess to as it is. I don't claim that you necessarily ARE wrong, but I claim that there must exist a possibility that you MAY BE wrong.