Tendency to cherry-pick or distort information to fit a pre-existing viewpoint.
Confirmation bias isn’t one particular bias; rather it is a collection of biases that all have the same goal: Validate an existing viewpoint.
We all have egos, and most of us hate being wrong, as this is a direct assault on our belief that we are smart human beings. Often this leads us to engage in irrational behavior to justify logically dubious beliefs and positions. We chery-pick information that is helpful, while ignoring context and contradictory information. We distort criticism, engage is straw-man arguments or other logical fallacies to try to win “the debate.”
When confirmation bias kicks in, logic will always lose. Exposing the underlying feelings is often the only way to expose illogical beliefs.