And I guess the exact opposite of this statement is to create a villain who is evil only for the sake of being evil, or is only evil for the sake of a story plot.
And if someone is simply evil only to give your hero someone to fight, then they run the risk of becoming simply a caricature of a bad person, instead of a living breathing villain.
In short. They don’t feel real.
So what if this world was actually real? Just for a moment, imagine it...