Fanaticism

Fanaticism (from the Latin adverb fānāticē [fren-fānāticus; enthusiastic, ecstatic; raging, fanatical, furious][1]) is a belief or behavior involving uncritical zeal or an obsessive enthusiasm.

Tõnu Lehtsaar has defined the term fanaticism as the pursuit or defence of something in an extreme and passionate way that goes beyond normality.

[4] Fanaticism occurs most frequently when a leader makes minor variations on already existing beliefs, which then drives the followers into a frenzy.

[4] The most consistent thing presented is the priming, or preexisting, conditions and mind state needed to induce fanatical behavior.

Each behavior is obvious once it is pointed out; a closed mind, no interest in debating the subject of worship, and over reaction to people who do not believe.

The Fanatics of Tangier by Eugène Delacroix , Minneapolis Institute of Arts
Etienne-Pierre-Adrien Gois, Voltaire defending Innocence against Fanaticism , circa 1791.
Japanese holdouts persisted on various islands in the Pacific Theatre until at least 1974. Hiroo Onoda offering his military sword on the day of his surrender.