I already answered this. Slavery existed. Has existed for most of history. Still exists. Will exist for centuries to come in some areas.
Slavery is a man-made institution. It's not out of the realm for the prophets to address it. It makes perfect sense that it would be. Is owning slaves a sin? It absolutely is not. That's the law of man. Treating them poorly? Harming them? Yeah. Maybe then it would be sinful. But slavery was an ordinary thing in the time of the writings. Of course there would be divine guidance on how to treat a fellow human being in that social constraint.
Are all slave owners unrepentant sinners and doomed to hell? Nope.
There are laws regarding slavery in the constitution. Guess we should just chunk that shit too.
Therein lies my point. Despite everything you said, there is no way to make me believe that any form of slavery is justified and more importantly, that the God I worship and have learned about all my life would encourage or condone it's existence. And it took centuries before most civilized cultures finally abolished it through laws. No, I don't think all slave owners are/were sinners. Again, goes even more to my point. Slavery in many forms was common practice in those times. The things Paul wrote of were things that were part of his culture, including slavery and ghey butt secks. I used the slavery reference to illustrate that those who say every word of the Bible is God and the Holy Spirit speaking through certain prophets or men, are "cherry picking" themselves to bolster their argument.
Paul said no to homosexuality. Then, he instructed slaves to be just as obedient to their earthly masters as they are to Christ. Didn't condemn it. Didn't even hint that it was wrong. You can't say every word written is the divine word of God and pick out Paul's stance on homosexuality to justify your argument, then just call slavery an accepted practice of the times. I take it the Holy Spirit was on coffee break while Paul was writing that.