Here's the thing: All human societies had slavery as part of normal existence through all of recorded history. The society you're trying to 'dismantle' was and is the first one to eliminate it. Yes, it did have slavery, and genocide, and conquest, and unfairness as part of the history. It's still as I put it - and further I invite you to find me an example of a human society that does NOT have those elements in the history, from any time-frame we know about.