The experiment was brave and I hope Social Scientists have the balls to do it again.
To create a new enviroment 'bubble' were the everyday customs, status roles and LAWS end at the door and it's down to people given two different mandates of power-positions and objectives,,,is a fantastic experiment which can be used to the benifit of society.
And remember - it was traits already present, repressed or otherwise, that excisted in those people that emerded under those condistions, they are responsible for thier own actions, not the person who gave them the choice to go into a new 'world' effectively.
Not all of them turned facist or murderous as far as I'm aware.