Fixations With a Lethal Purpose: Extreme Overvalued Beliefs
Briefly

Delusions, which manifest as firmly held false beliefs, disrupt one's connection to reality. Unlike obsessions or overvalued beliefs, they involve a significant break with consensus reality.
Extreme overvalued beliefs, such as those held by extremists, tend to provide a distorted justification for harmful actions, allowing fixation to evolve into potential violence against perceived enemies.
Read at Psychology Today
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