Authority

There was this psychologist who had done an experiment to prove that authority can make a person to carry out task that you want him to do, even to the extend of causing hurt or death of someone else.

This psychologist name is Stanley Migram. He'd got few volunteers to partake in his experiment and paid them some money. He then paired them up explained to them that one of them from every pair would take up the role of a teacher, and to teach the other one (who would be known as the student) of some new things. And whenever the student make a mistake, the teacher would electrocute the student with voltage beginning from 5volts, and increased by 5volts per every mistake make.

When the voltage reached close to 200volts, the students were already screaming and begging for out, and upon hearing this, the teachers would look at Migram. But Migram said to them: "Please carry on". Everybody knows that being electrocuted with high voltage like 200volts can kill a person. The teachers knew that but they still followed Migram's order, relunctantly though.

In that environment, Migram had the authority. He paid the volunteers, he was in a doctor's suit and the experiment was carried out in his lab. Hence the teachers felt obligated to carry out his orders.