groupthink

[groop-thingk]
noun
1.
the practice of approaching problems or issues as matters that are best dealt with by consensus of a group rather than by individuals acting independently; conformity.
2.
the lack of individual creativity, or of a sense of personal responsibility, that is sometimes characteristic of group interaction.

Origin:
1950–55; group + think1, on the model of doublethink

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World English Dictionary
groupthink (ˈɡruːpˌθɪŋk)
 
n
a tendency within organizations or society to promote or establish the view of the predominant group

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
But the risk that it is a sort of self-reinforcing groupthink merits attention.
That's the kind of thing that leads to well-known phenomena of conformity,
  obedience to authority, and groupthink.
So this is not something where groupthink works for an answer.
But in part, the subprime lending crisis may have been more a matter of
  groupthink and greed.
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