[JumpCrisscross]

> Slavery had basically been a thing for all of human history up to that point

Would note that New World-style chattel slavery doesn't seem to have broadly historically precedented.

[eucyclos]

True, but if your point is that most slavery regimes throughout history were less awful for the slaves, it's also worth remembering that most accounts of those regimes weren't written by the victors of a war that saw the other sides slavery practices as justification for said war.

[JumpCrisscross]

> if your point is that most slavery regimes throughout history were less awful for the slaves

Not at all. The fact that we have practically zero first-hand accounts from the slaves of antiquity speaks volumes to their treatment. My point is on scale (and with that, the institution's effect on the societies that hosted it).