Ah, but here’s a trick question:
Since survival is good accomplished by the Golden Rule, is it true that cultures/societies which last the longest are therefore the best (most good)?
When a society that violates the Golden Rule comes with an expiry date, how is it survival? More importantly, how is such a society one that is thriving? (Note the key difference in terminology). "Longest lasting" is no criteria - influence, gravitas and sustained success are more important. Under these classifications, slave states fail miserably.