The Joker is a madman with a huge body count, so his death shouldnt elicit even the slightest bit of sympathy from anyone. Yet no matter how hard you try, when he finally dies at the end of Arkham City, you cant help bet feel sorry for him. https://www.youtube.com/watch?v=sIXmTkJ9gtU Through a combination of Mark Hamills performance and an over 60 year relevance to popular culture, the death of the Joker generates sadness within anyone with an attachment to the character. It is presented not as a triumph or a victory, but as a sad end to a person ghoulishly twisted and perverted by some unknown tragedy. This subtle complexity is part of what makes the Joker a great villain, which is why you are so sad to see him go.