Why do people sometimes feel that they need to socially conform to what is going

Why do people sometimes feel that they need to socially conform to what is going on around them even if they do not want to do so? How do the social institutions of our country (e.g. schools the health care system the economy religious organizations) play a role in encouraging social conformity as well as social deviance?In reviewing the following video Solomon Aschs Conformity Experiment Today at http://thesituationist.wordpress.com/2008/06/11/solomon-aschs-conformity-experiment-today describe why the individuals in the Asch experiment usually gave the same answer when they probably knew that it was wrong!