We have to remember that Jekyll and Hyde are the same person, 'he represents the cry of victorian man of his imposed underground'. Dr Jekyll on the outside wants to appear better than everyone else, but hide his 'sinful' side.
Here are two famous experiements testing the psyche of 'regular people', the teacher is told to administer an electric shock every time the learner makes a mistake increasing the level of shock each time. There were 30 switches on the shock generator marked from 15 volts (slight shock) to 450 (danger – severe shock). The learner gave mainly wrong answers (on purpose) and for each of these the teacher gave him an electric shock.
It was a test of conflict between obedience to authority and personal conscience, on the surface a lot of the people were anxious in causing the shocks, but were conflicted because they were told to do it by an authority figure. Being the guy in the 'white coat'.
Milgrim Shock Experiment
Stanford Prison Experiment
To investigate how readily people would conform to the roles of guard and prisoner in a role-playing exercise that simulated prison life.To study the roles people play in prison situations, Zimbardo converted a basement of the Stanford University psychology building into a mock prison. He advertised for students to play the roles of prisoners and guards for a fortnight.
The results were brutal within a very short time both guards and prisoners were settling into their new roles, with the guards adopting theirs quickly and easily.
Within hours of beginning the experiment some guards began to harass prisoners. They behaved in a brutal and sadistic manner, apparently enjoying it. Other guards joined in, and other prisoners were also tormented.