[Serious] Moral Obligations toward Possible Worlds

[Angrboda]

Its certainly difficult to figure out what objective responsibilities we possess toward some unknown future generation.  We don't have alot of objective data about those future generations.

Still when we say that one time we thought there was nothing wrong with slavery - that's not entirely true.  There's never been a time in which slavery existed that there weren't people who thought it was good -and- people who thought it was bad.  It's never been the universal assumption that human bondage is good.  It's rarely ever been the case that human bondage was thought to be good for anyone other than others.  Romans kept slaves, but commonly didn't think that romans should be slaves. Slaveholders rarely imagine themselves to be equivalent to their property.

I'm not vouching for he truth of the intuition, or of the thing that could very well be pure intuition and also untrue - just pointing out that accuracy in our framing of moral issues could provide clarity in our conclusions about our moral conclusions.

Quibble noted. And I said a majority, not everyone. The majority of Romans had no problem enslaving non-Romans. That is no longer the case. American slavers didn't endorse slavery for whites. That doesn't mean nothing changed. Your quibble falls apart under inspection.