Hunter gatherers lead brutish, short lives. In studies of (then) extant stone-age societies (Papua New guinea, etc), the typical chance of murder being someone's ultimate cause of death was over 25%. In some tribes higher.
Turning back the technological clock means consigning people to pretty awful lives, living "in harmony with nature" is grossly over-rated.
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"Government, even in its best state, is but a necessary evil; in its worst state, an intolerable one." — Thomas Paine
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