Mindset

Too much knowledge can cause a false sense of confidence. And
the more knowledge we have, evidently the more confident we
become, even though our accuracy may not be enhanced.

Richards J. Heuer Jr. wrote about this common phenomenon in
a 1979 article entitled, "Do You Really Need More Information?"
He writes:

"Information that is consistent with our existing mindset is perceived
and processed easily. However, since our mind strives instinctively for consistency, information that is inconsistent with our existing mental image tends to be overlooked, perceived in a distorted manner, or rationalized to fit existing assumptions and beliefs. Thus, new information tends to be perceived and interpreted in a way that
reinforces existing beliefs."