The inability or refusal to listen to one's own instinct or 'gut feeling' but to instead follow the majority for fear of being wrong, ostracized or ridiculed.
If a herd of animals were haded for a cliff, for the sake of a herd mentality, I doubt one would veer off or stop to save its own life.
Crabs in a bucket can easily escape from the bucket one at a time, but instead of doing that they pull each other down whenever one rises to the top - thus insuring their collective demise.
This is analogous to the behavior of a person who diminishes or pulls down anyone else who achieves or is about to achieve success greater than their own.
Crab mentality: We all like to see our friends get ahead, but not too far ahead.
The mentality were you have decided to fuck anxiety and worrying about shit. At this point in life you have just wanted to be happy and that is the F.R.M (floating rock mentality). WE ARE LIVING ON A FUCKING FLOATING ROCK SO WHY ARE YOU WORRYING ABOUT HOMEWORK!!! Go live your life! Life is short and you only get one so have as much fun as you can and live it up and experience everything!!
The idea that since every man (and his gun) is needed for the common defense of the group, any one man's behavior, short of murder, must be tolerated, even including mild insanity and such serious crimes as rape. (From the Afrikaans voortrekker word 'laager' - a circle of wagons forming a defensive perimeter, as when the days journey was done and the group settled in for the night)
When the cop shot the unarmed perp his buddies closed in with their laager mentality and made a thorough investigation of the facts impossible, intentionally misplacing evidence and confusing investigators.