“And sin, young man, is when you treat people like things.”
Terry Pratchett, Carpe Jugulum
This is the root of all bigotry: the idea that some people are things. You must remember that everyone is a person. All of the people you deal with are people. They are heroes of their own stories. They have their own lives. And this may seem obvious. But how easy is it, when you’re in a hurry, to forget that other people matter? How easy is it to justify treating people like things when you were wronged?
Seeing people as things is expedient. But expedient is not just. Efficiency is not morality. Be inefficient. Take time to deal with each person as though they are a person.
Professor Harbinger's School for Villains 