History begins the day you are born unless someone takes the time and trouble to bring you up to speed. The social parasites that are the British Monarchy evidently have not bothered to inform the heir apparent. Learn from history or repeat its mistakes.
Prince Harry is not the heir apparent (William is), so it would seem that he has developed the mindset that since he will have basically no responsibilities in life that he can just go ahead and be a spoiled uncaring prick.