Rationalization bias is a cognitive bias that causes individuals to justify their actions, decisions, or beliefs in a way that aligns with their preexisting beliefs or desires. This bias can lead people to overlook or ignore evidence that contradicts their beliefs, and instead, seek out information that supports their viewpoint. It can also manifest as a tendency to downplay the negative consequences of one’s actions or to attribute successes to personal abilities rather than external factors. Rationalization bias can hinder critical thinking and lead to irrational decision-making, as individuals prioritize their own beliefs and desires over objective reasoning.