Crab mentality
Crab mentality, sometimes referred to as crabs in the bucket, is a way of thinking best described by the phrase, "if I can't have it, neither can you." The metaphor refers to a bucket or pot of crabs. Individually, the crabs could easily escape from the pot, but instead they grab at each other in a useless "king of the hill" competition which prevents any from escaping and ensures their collective demise. The analogy in human behavior is claimed to be that members of a group will attempt to negate or diminish the importance of any member who achieves success beyond the others, out of envy, spite, conspiracy, or competitive feelings, to halt their progress.
See also
The Dog in the Manger
Prisoner's dilemma
Allegory of the long spoons
Law of Jante
Terror management theory
Tall poppy syndrome
References