[DustinCalim]

This is the commitment and consistency effect.

The extreme cases can be found in cults where followers cling tighter to their beliefs once exposed.

A great example are the followers of Harold Camping, the Christian radio broadcaster who predicted the end of the world a few years ago, and kept re-predicting when it never came.

http://en.wikipedia.org/wiki/Harold_Camping

[Gostport]

But to complete the Camping story, and validate your argument (you still believe only the original, not the recant); Camping stopped after 2 failed dates, re-read his source material, and stated that he no longer believed that anyone could predict the end of the world. (Source: Netflix documentary on Camping)