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In page Social dominance theory:

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Consistent with the observation that, in patriarchal societies, males tend to be more dominant than females, SDT predicts that males will tend to have a higher social dominance orientation (SDO). As such males will tend to function as hierarchy enforcers, that is, they will carry out acts of discrimination such as the systematic terror by police officers (Sidanius, 1992) and the extreme example of death squads and concentration camps.[1] This is supported by evidence such as police officers possessing measurably higher levels of SDO.[2] SDT also predicts that males that carry out violent acts have been predisposed out of a conditioning called prepared learning.[3] This learned fear readily enables males to commit acts to groups they fear.