Theory
To explain the findings of these studies, Lerner theorized the prevalence of the belief in a just world. A just world is one in which actions and conditions have predictable, appropriate consequences. These actions and conditions are typically individuals' behaviors or attributes. The specific conditions that correspond to certain consequences are socially determined by the norms and ideologies of a society. Lerner presents the belief in a just world as functional: it maintains the idea that one can impact the world in a predictable way. Belief in a just world functions as a sort of "contract" with the world regarding the consequences of behavior. This allows people to plan for the future and engage in effective, goal-driven behavior. Lerner summarized his findings and his theoretical work in his 1980 monograph The Belief in a Just World: A Fundamental Delusion.
Lerner hypothesized that the belief in a just world is crucially important for people to maintain for their own well-being. However, people are confronted daily with evidence that the world is not just: people suffer without apparent cause. Lerner explained that people use strategies to eliminate threats to their belief in a just world. These strategies can be rational or irrational. Rational strategies include accepting the reality of injustice, trying to prevent injustice or provide restitution, and accepting one's own limitations. Non-rational strategies include denial or withdrawal, and reinterpretation of the event.
There are a few modes of reinterpretation that could make an event fit the belief in a just world. One can reinterpret the outcome, the cause, and/or the character of the victim. In the case of observing the injustice of the suffering of innocent others, one major way to rearrange the cognition of an event is to interpret the victim of suffering as deserving of that suffering. Specifically, observers can blame victims for their suffering on the basis of their behaviors and/or their characteristics. This would result in observers both derogating victims and blaming victims for their own suffering. Much psychological research on the belief in a just world has focused on these negative social phenomena of victim blaming and victim derogation in different contexts.
An additional effect of this thinking is that individuals experience less personal vulnerability because they do not believe they have done anything to deserve or cause negative outcomes. This is related to the self-serving bias observed by social psychologists.
Many researchers have interpreted just world beliefs as an example of causal attribution. In victim blaming, the causes of victimization are attributed to an individual rather than a situation. Thus, the consequences of belief in a just world may be related to or explained in terms of particular patterns of causal attribution.
Read more about this topic: Just-world Hypothesis
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