Groupthink leads to poor decision making and typically results in a lack of creativity.
It is cultivated by state using powerful propaganda mechanism.
In its essence groupthink can be viewed iether as: From this point of view skeptics can be viewed as people with high natural or trained ability to withstand group pressure. As social importance of group conformity is high they were often persecuted.
Some heretics were burned on stake during Middle Ages.
The term groupthink is more related to the issues of social pressure within social groups, while a similar term conformism is more related to the propensity of some individuals too easily succumb to group pressure.
While in minimal dozes it is necessary for group functioning, groupthink is a double-edge sword and excessive amount of groupthink typically endanger both the group and affected individual.