Social Proof
We copy the behaviors of others, especially in unfamiliar situations. ‘Correct’ decisions or behaviors are dictated by the actions of others, particularly those we’re similar to or aspire to become. "Social influences are a problem because they reduce 'group diversity without diminishing collective error'" — Noise
Related studies:
Bandura & Menlove (1968). Factors determining vicarious extinction through symbolic modeling. Journal of Personality and Social Psychology.