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In sociology, siege mentality is a shared feeling of victimization and defensiveness—a term derived from the actual experience of military defences of real sieges. It is a collective state of mind in which a group of people believe themselves constantly attacked, oppressed, or isolated in the face of the negative intentions of the rest of the world. Although a group phenomenon, the term describes both the emotions and thoughts of the group as a whole, and as individuals.
The result is a state of being overly fearful of surrounding peoples, and an intractably defensive attitude.
The related term bunker mentality may be used in the context of businesses facing competition or downsizing, with a similar paradigm applying to some religious groups.