Group thinking<ref>Janis, I. L. (November 1971). "Groupthink". Psychology Today 5 (6): 43–46, 74–76</ref><ref>[http://en.wikipedia.org/wiki/Groupthink Wikipedia contributors. "Groupthink." Wikipedia, The Free Encyclopedia.]</ref> is a state where the group 's [[SON]] is unchallenged by criticism. It can be caused by group settings that inhibit any criticism on the group 's [[SON]], like excluding members that do not conform to the groups beliefs, or denouncing refuting evidences as illusions, heresy or efforts of some other rival ideology to break the group ideology.