This openess did not mean “come on in, everyone is a member of the group”. This is a key difference I have with universalists, who use the facts I pointed out above to different ends than most people in the past would have accepted. There was a question I recall from my studies in Japanese. A Japanese Confucian scholar that also admired Lao Tzu and Mencius was asked by someone “If Confucius and Lao Tzu led an army from China to invade the Land of the Gods[Japan], what would you do?” The scholar replied “I would fight them of course.” If the Greeks fought Rome or the other way around, I am sure that Publius Cornelius Scipio(a known Philhellene) would have sided with Rome. People still had their loyalties. Klayonus ought to have mentioned some of the strict citizenship laws in the ancient world. Also, if you mix your group out genetically, its distinct character will be lost. Does anyone want to end up like the Egyptians? Right in Aristotle, there is this: