It shows strong convergent validity that it is connected to favorable appraisal and dedication to a specific cause, discriminant validity that it is not connected to psychological dysfunctions like depression and suicidal thoughts, test-retest reliability, and the capacity to foresee important future events that is the devotion to a goal and sadness if the cause fails.
Finally, this measure demonstrated acceptable predictive validity for emotional, cognitive, and behavioral variables.
People who have a stronger sense of belonging to a group are also more prepared to make sacrifices for the good of fellow ingroup members.
According to cross-cultural research, the greatest expressions of primary group identification are constrained by sacred principles, frequently manifested as religious convictions or transcendental philosophies, which causes certain groups to succeed because at least some members hence take nonrational commitment and engage in combat for a large cause even sacrifice themselves.
This is proved by the facts during World War II that due to loyalty to ingroup members and cause rather than normal reward mechanisms, such as money and promotion, revolutionary and insurgent forces (such as the ISIS) have defeated armies even with greater weapons and personnel.
People report being more willing to sacrifice themselves when their sense of significance is low, which inspires self-sacrifice more than normal destructive feelings.