In atrocious situations, such as philip zimbardo's simulated prison experiment, some people succumb to the situation and others do not. the difference best illustrates:

I believe the answer is: Interactive influence of persons and situations

The final behavior that people display is the combination of their emotion, knowledge, capabilities, and principles.
But, in some situations, the study found that some people might throw away their emotion and principles if they're around like-minded people, a granted a power that might give them control on a certain situation.