In 1971, Philip Zimbardo's experiment demonstrated the power of the situation and the interaction between social interaction and social structure.
There are many videos of the experiment, search two or three videos on internet to see different perspectives about this experiment.
After viewing the videos, if you had been a guard, do you think you would have been more likely to go along with the other guards or would you have resisted or spoken up about treating the prisoners the way you would have wanted to be treated if the roles had been reversed??