Yes, there have been cases of killers who reportedly had a seemingly normal and loving childhood. It's important to remember that human behavior is complex, and not all individuals who experience difficult or traumatic childhoods become violent, just as not all individuals with loving childhoods remain non-violent. Many factors contribute to a person's development and actions, and it is often a combination of genetics, environment, upbringing, and personal experiences that shape a person's behavior.
In some cases, individuals who appeared to have had loving and supportive childhoods may have experienced internal struggles or psychological issues that were not immediately apparent to those around them. Additionally, some individuals may have developed violent tendencies later in life due to various stressors, mental health issues, or other factors.
It's essential to avoid making sweeping generalizations based on isolated cases and remember that most people who experience love and support during their childhood do not engage in violent behavior. The study of human behavior and its relationship to violence is a complex field that involves multiple disciplines, including psychology, sociology, and criminology. It's crucial to approach these topics with sensitivity and nuance, recognizing that each case is unique and cannot be easily categorized.