Willful and conclusive ignorance is a known human mechanism. It is undergone for the benefit of eliminating confusion and permitting stability of mind when looking at things becomes too tiresome and thinking too painful.   One simply adopts some sort of conclusion (such as, "Goddam towelheads are all the same", for example) and uses this conclusion as a reason for no longer thinking about questions that are hard to penetrate (such as "What's up with the Muslim population of this planet these days?"). So you can paint everything else black and not think about it.

This can be undone by analyzing and recognizing the conclusion itself for what it is.

A