Question

Many members of a street gang believe privately that their initiation process is too harsh and dangerous. however, they do not express these beliefs because they assume that everyone else thinks the initiation process is just fine. this scenario exemplifies

Answer 1

I believe the answer is: pluralistic ignorance.
pluralistic ignorance happens when majority members of a certain group privately reject a certain point view, but somehow assume that other members accept that point of view.
This resulted in a situation when most members decided to stay quiet and comform to the point of view regardless of the disagreement.