I am struggling to deal with your epistemological skepticism SlimBoyFat.
You once told me that we couldn't say unequivocally that the earth is not flat and always will be.
I think there are some things that do not need to be justified philosophically, they are just true. Let's see if you will allow any of them. They are based on Sam Harris' book "The Moral Landscape".
1. Questions of morality only matter where there are conscious minds.
2. Minds are capable of a range of positive and negative states.
3. Happiness is better than misery.
4. A world in which there is maximum possible happiness is better than one in which every conscious mind experienced the maximum misery all the time.
5. It would be morally wrong to try to move us away from the first sort of world towards the second.
6. It is possible to be mistaken about what actions will tend to increase well being and which will diminish it.