Perhaps *groupthink* works.

M-W:

> [*groupthink*](http://www.merriam-webster.com/dictionary/groupthink):
> a pattern of thought characterized by self-deception, forced
> manufacture of consent, and conformity to group values and ethics

The first paragraph from [Wikipedia](https://en.wikipedia.org/wiki/Groupthink) on *groupthink*:

> Groupthink is a psychological phenomenon that occurs within a group of
> people in which the desire for harmony or conformity in the group
> results in an irrational or dysfunctional decision-making outcome.
> Group members try to minimize conflict and reach a consensus decision
> without critical evaluation of alternative viewpoints by actively
> suppressing dissenting viewpoints, and by isolating themselves from
> outside influences.