Arguments for moral progress and moral regress aren't symetrical. If you have moral drift then naturally you will also have moral regress from the point of view of anyone who sticks to the older values.
"From the point of view" elides the central issue. Either there are moral facts or there aren't. If there are not moral facts, moral progress and regress are not well defined concepts. If there are moral facts, the concepts are well defined - although if one believes in conflicts in moral facts, then the concepts are much less impressive.
It's very clear that Sam is a moral realist, sub-type value monist. For purposes of this discussion, I'm an anti-realist, sub-type error theorist. I thought you were an anti-realist, but your response here suggests you are a moral realist, sub-type value pluralist. If you are a value monist, then I don't see how you advance your object level values by defending Sam's different values.
I'm wasn't trying to promote any value set in this branch of the conversation. I was trying to via discussion learn more about the arguments for egalitarian vs. non-egalitarian family arrangements.
I've written extensively on my current position on morality elsewhere. Like I said in the other comment I think we're having a misunderstanding but I'm not sure where. I think its most plausible I'm missing some context.
As to moral regress, value drift seems to me obviously bad for any set of values that seeks to impact the world. I think we might mean different...
Related to: Voting is like donating thousands of dollars to charity, Does My Vote Matter?
And voting adds legitimacy to it.
Thank you.
#annoyedbymotivatedcognition