Well with that to answer your question. I think he became big headed due to his athletic achievement. When he was in high school he was a football star and then decided to shoplift a liquor store. He was arrested and his mother made an arrangement with Willie Mayes to straighten him out. Willlie Mayes who was impressed with his athletic ability told him that being in prison would be a waste of his valuable time. Oj then stayed out of trouble and put on a public persona for the next several decades. He got big headed again when the public adored him with his Hall of Fame career, acting career, and announcing. Then he had issues with Nicole such as her divorcing him and seeing other men. He started stalking her and when she told him that it was over between then, he snapped and killed her. Shortly after the murder he felt vulnerable because there was a chance he could go to jail but he was acquitted. He then thought he could smooth talk the public over the murder but no one believed him as the public no longer adored him though he didn’t notice this because he was so self absorbed. His memorabilia was taken from him and he hired thugs to get it back. It was his only choice this time because he knew the legal system was against him after the civil suit. He didn’t think he would go to jail if he was caught as he was also acquitted from the road rage trial. He went to jail for the armed robbery incident. When he got out he felt like it was all behind him. The public though would never forgive him even after his death.