optimism bias
A cognitive bias where a person believes they are less likely to experience negative events and more likely to experience positive events compared to others. Used in psychology and everyday contexts.
When you have an optimism bias, you tend to underestimate your own health risks.
Many people, due to optimism bias, underestimate the probability of being in an accident.
Compound of 楽観 (rakkan, 'optimism') and バイアス (baiasu, from English 'bias').