Sometimes a sychological weakness can hurt others. I am currently writing a story where one of the characters has a psychological weakness that has caused him to hurt others in the past. There's nothing wrong with him morally, which is why he isolated himself in order to keep from hurting anyone else. His want. His Need however, is friendship.
Writing Advice by Chuck Palahniuk | "Writing Advice: by Chuck Palahniuk In six seconds, you’ll hate me. But in six months, you’ll be a better writer. From this point forward—at least for the next half year—you may not use “thought” verbs. These include: Thinks, Knows, Understands, Realizes, Believes, Wants, Remembers, Imagines, Desires, and a hundred others you love to use. The list should also include: Loves and Hates. And it should include: Is and Has, but we’ll get to those later.--"