PhilosophyMemes

"If morality is objective" doing a heavy lift there. Morality is consistently different between different cultures and societies, and it consistently changes over time, which is a pretty good argument that morality is subjective

The idea that slavery, particularly the way it was conducted in the Americas, was mostly acceptable at the time was always a myth. There were always those who saw it as reprehensible and many who were swayed once seeing it in practice. There were even die-hard racists who viewed Africans as subhuman who found the treatment of slaves disgusting.

Ok, I'll argue this.

Morality is subjective. Not only temporally, but even across modern day cultures and we are subjects of our environment and morality is learned, full stop.

No one is born in China, spontaneously starts speaking Farci.

We learn our morals from our surroundings. Some people may be genetically born more likely to be curious/moral or intellectually shut off/violent. But at the end of the day, we are all products of our environments. It was just a few hundred years ago when (besides the tech) people wouldn't be giving a shit about what's going on right now. And we are evolved from the better killers and/or those quicker to "jump the gun".

Doesn't make it right, but it is the way it is.

It's both. Morality is absolutely, unquestionably subjective in many ways (although some core axioms can go a long ways to finding an objective set of morals), and slavery is always bad as practiced in the economies of the US past and present. (and basically everywhere else, but I'm sure some nerd could come up with a hypothetical where it would be the least bad option available)

Morality is actually the Venn-diagram intersection of relative & absolute.

Always has been.

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Morality always has to bow to survival. Cannibalism might be immoral, but if you are lost at sea survival may necessitate such acts. (Not saying this applies to slavery, just in general)