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2012 Interview With Peter Turchin: ‘2012 Is Bullshit; 2020 Is When We'll Really Be in Trouble’
Presented mostly without comment, although I found this last bit interesting:
[ViceMagazine] In your view, what causes these upheavals?

Historically, the trouble has always come from people with power, and the number of those people who want the most power. There are too many political entrepreneurs who are all trying to get power, and they get frustrated, which is how revolutions start: when members of the elite try to overturn the political order to better suit themselves.
Posted by: charger 2020-06-08
http://www.rantburg.com/poparticle.php?ID=573808