How would one kill groupthinking?

kill the group

kill the thinking

You can't without ironically controlling what people think. Because in any given scenario with a mob of people, someone is gonna have an idea that seems good to others and those people will follow that idea they see as good and cooperate. The only way to end group mentality is to control thoughts to ensure everyone always has a different opinion.

kill

Promote the hugbox that you find acceptable and just ignore the fact that it too is groupthink.

machine guns and duffel bags