I thought you'd know by now that I won't find that argument convincing unless you can do it for ALL moral positions, not just the extreme ones.
It doesnt matter whether something is extreme or not to prove objective morlaity. The fact that you acknowledge that there is at least one moral situation where we can say that murder is objectively wrong is enough to support the argument that there are objective morals.
Remember I am making the positive claim and you are making the negative (skeptical) claim. So it is you who has to show that there is not a moral truth in every situation and not me. I only have to show that morality is objective in one example to support my case.
I've already explained so many times that I've lost count that our shared view that murder is bad stems from the fact that we are social creatures, and the moral viewpoints that are common among members of our society stem from the fact that those are viewpoints that we needed in order to keep that society going. Why do you keep making me explain it again and again?
I have also explained to you a number of times that the idea that the "social conditioning arguement"has a number of problems (logical fallacy and incoherence). As this seems to be an issue that you cannot acknowledge I will spell the objections out clearly so you can address them 1 by 1.
1) Its a logical fallacy. It doesnt follow that our common moral values is because of living in the same society and therefore morals are subjective and not objective. I gave you independent evdience that this is a well known fallacy. This alone should refute your arguement based on being faulty logic.
2) It is also widely accepted that we all (regadles of society or culture) agree on a core set of morals. So this negates that morals are the result of social condition.
3) I have shown you research evidence which shows we are born with knowledge of certain moral truths. Babies and infants know common moral values before they can be encultured or socialized by their society or family. Also these common moral values are consistent regardless of that culture or families beliefs or values.
4) Social conditioning does explain moral disagreement and moral progress.
How can social conditioning be the reason for why a society has common morals when there is no way to reach moral agreement under subjective morality in the first place? Any social reforms or civil rights changes are usually made by non-conformists who object to the common socially conditioned values.
So they are seen as outsiders disrupting the so called common socially conditioned agreed morals. That cannot happen under a subjective system because there are no moral right and wrong. There can be no real disagreement about what is right and wrong. The non-conformist would actually be seen as a trouble maker who is not going along with the agreed values.
Nor can morality progress under a subjective system. If morality is just opinions and nothing is really right or wrong morally and there is no objective basis to measure moral progress then moral progress cannot happen.
Andrew Fisher explains this that if there was progress this seems to imply that we are somehow moving closer to the truth of how the world actually ought to be. But if moral realism is false then it seems that there could be no standard or benchmark and it is hard to see why we would think moral progress was possible at all.