Idiocy n. : The condition or quality of being an idiot; absence, or marked deficiency, of sense and intelligence.

Example:
What is the psychology behind the military-type punishing of the entire group for one person's Idiocy?

Taxonomy
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Defination from the web:
idiocy from the Merriam-Webster Online Dictionary with audio pronunciations, thesaurus, Word of the Day, and word games. ... Learn more about "idiocy" and related topics at Britannica.com. See a map of "idiocy" in the Visual Thesaurus. Pronunciation Symbols. Share this entry: ...