You've been reading about the frustration-aggression hypothesis, and find that a scapegoat refers to:

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The frustration-aggression hypothesis suggests that when individuals are frustrated, they may become aggressive. A scapegoat, in this context, refers to a target (individual or group) against whom one can direct their aggression, often without fear of repercussion. This concept is used to explain how, in times of social stress or frustration, certain groups or individuals may become unjust targets of collective aggression.

You've Been Reading About the Frustration-Aggression Hypothesis, and Find That