Cognitive distortions insulate us from reality and allow us to concentrate on things we can change. Unfortunately, people's perception that they can face undiluted reality is dead wrong. Our mental defense mechanisms are probably geneticly encoded and allow us to distort reality in ways that allow us to function better.
... people tend to be overly optimistic about their own abilities and fortunes - to overestimate their standing in class, their discipline, their sincerity.
Culture, religious belief and experience all help shape a person's sense of moral standing in relation to others, psychologists say, and new research is helping to clarify when such feelings of superiority are helpful and when they are self-defeating.
"But the point is that many types of behavior are driven far more by the situation than by the force of personality. What someone else did in that situation is a very strong warning about what you yourself would do."
So-called self-enhancers think that they're blessed, that they're highly appreciated by others and that they'll come out on top...
"Self-enhancers do very well, across the board, on measures of mental health in these situations,"
http://mobile.nytimes.com/article?a=360755&f0=25