Bonhoeffer’s Theory of Stupidity Explains the World Perfectly
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Add to that cults, religions, organised crime, justice system, corporations, institutions, unions, syndicates, conglomerates, cartels, states, families, couples, any entity bigger than an individual. Besides that, I suspect insanity in individuals is actually broader than suspected.
As a whole, everything just kinda work mostly because kind, sane and sensible individuals can be found anywhere, everywhere. Let's say we need more of these.