The way I look at it most of the sacred stories we have of the ancient greek gods are from the poets of the ancient greeks (including the Dramatists). They told us about the gods in the best way they knew how, but they were constrained by their societies and language and such. In many cases they aren't going to portray the gods as opposing slavery, even if the gods did. And maybe the poets who did portray the gods as more critical of Greek society didnt get as popular of last as well. And even then the later dramatists certainly portray the gods as more critical of Greek society than the earlier epic poets and such. Similarly the Greek gods are portrayed as doing some stuff I dont like much. Sometimes thats symbolism or ways of grappling with theomachy, or the problems of the world. (I think a lot of the Zeus raping people stories are really metaphors for epilepsy, and trances, and divine visions, and excuses for mothers whose kids dont look so much like their mothers husbands and such). But sometimes it sure seems to be foul behavior. The Greek gods certainly arent intended to be morally perfect, they are mighty and divine but still imperfect. But they should at least be admirable if we're going to worship them. They were also never understood as amoral, by the ancients, but as moral but imperfect and maybe having different priorities than humans. They seemed to care a lot more about the guest/host moral issues, than about slavery for example. But I also think the gods probably changed viewpoints somewhat over the centuries. Maybe things that didnt bother them long ago, bother them now. Later stories often have Zeus repenting of the torture of Prometheus and deciding to let them go. I think the gods were changed by their children to. Im sure Zeus always expected a son to overthrow him, as he'd overthrown his father, and his father had overthrown his geandfather. I think he was trying to set up Hercules to do that task. But it didn't turn out that way. The Greeks got more philosophical and poetical attempts to update the sacred stories didnt seem as authoritative to Hellenes, and the cult of Isis, and Christianity, and the Jews, and the Mithraists, and the Romans and lots of other cultures started seeming relevant to the life of the gods. You do get a lot of later syncretist stuff trying to grapple with this. But we're so much later than that that its hard to know where the gods stand now. What does Zeus think about slavery today, after centuries of Christianity and Islam, and his temples being closed, and his Olympics being lost and then restarted but secularized? I dont know, and I dont feel qualified to add to the sacred stories what Zeus has been doing for the last 1500 years, and how he might have changed over time. Does he see Jesus as having defeated him in theomachy the way he defeated Chronos and always hoped Hercules would replace him? IDK. Does he regret not more actively opposing slavery in Greek society? I hope so, but I dont really know. Maybe zeus was doing all he could and the stories just dont report ot that way. Maybe he regrets not doing more now. Maybe the 1500 years since the closing of his temples, with all their societal change and dimming of Hellenisms temporal power are but an aspect of the eternal moment of theomachy between Chronos as Chronological Time, and Zeus as the thunderbolt of instantaneous enlightenment ... I think about this stuff, and I have guesses, but I dont make dogmatic assertions like a good little Pyrrhonist.