Zhao -- I'm at home and so can't listen to a podcast (too rude), but could you link to a couple of things outlining the case for the defence and a couple for the prosecution?
i suggest you find a time to listen to the mp3.
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for now, the version i'm interested in putting forth:
band level societies (such as the Dobe) with no leaders (except temporary), no division of labor, no private property, largely egalitarian, gatherer/hunters, was the dominant form of social organization for most of human history (at least 150,000 years).
during this time our ancesters gathered more fruits, nuts, vegetables than hunted. they were less violent, less aggressive, more egalitarian, than the picture painted by our society.
tribes, with permanent leaders, some division of labor, and some agriculture, came later. and cheifdoms, with more agriculture, more hierarchies, even later. all the way to nation states.
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the conventional version:
hierarchies, centralized power, slavery, subjugation, etc., have always existed, human beings are inherently selfish, violent and aggressive. our ancesters were primarily meat eaters and hunters.