Fatalism

"Fate or some mysterious force can put the finger on you or me for no good reason at all."
That's the last line of “Detour,” a classic B-grade noir. It's also an expression of one of the defining characteristics of film noir, which is a pessimistic fatalism. Many noir movies feature some seemingly miniscule decision or act which sets in motion an inescapable chain of events and dooms the hero.
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