Pol Pot was a communist, supported by the North Vietnamese communist conquerers.
There is a big difference in sustainable communal village living and communist dictatorships.
When TSHTF, I don't think the roving marauders will last long on foot carrying weapons. They will certainly be able to take out nearby weakly defended areas, but eventually, even with cannibalism, will starve. Some villages will survive.
The problems of the survivors is climate change and global pollution, along with the very long term effects of the pollution and depletions. The worst case scenario we are actually heading for at this time, leads to massive extinctions and includes an unsurvivable biosphere for humans for thousands of years.
So reducing population while going to non-CO2 and mercury polluting power and transport, in a decade is necessary just to reach a point of possible species survival. Really, a whole new morality and behavior system of all of humanity, a spiritual awakening(that some "primitive" people already have, or people like us enviro-whackos who are living the solar low consumption, composting, 3 Rs life)
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