Moral Symmetry of Good and Evil

"e;I love to kill people. I love watching them die."e; So said Richard Ramirez, the notorious Los Angeles "e;Night Stalker."e; Can we say that he, and others like him, are pure evil? Or, is that just a matter of personal opinion? This book is about morality. It's about proving good and evil are real. Why are they real? Symmetry.