Chance
Chance; the only morality in a cruel world. Chance doesn't have favourites; it's unbiased, unprejudiced and it picks the winners and the losers based on nothing; even if you are the worst man in the world, the most wanted criminal, you can still be a millionaire. If you have a heart of gold, if you are a total saint, you can still be a beggar on the streets. It's just the way chance works. Chance doesn't care how good you are, it just does things to you, like the Joker, chance is a mad dog, chasing cars, if it caught one it wouldn't know what do to with it. Like when it gets hold of you it doesn't think anything through; it just does things. Like the Joker.
It wasn't chance that killed Rachel, it wasn't even the Joker; it was Commissioner James Gordon and his unit of corrupt cops; cops I investigated myself while I was at Internal Affairs and found to be criminals. Surprisingly enough he didn't believe me and still kept them in his unit. It's because of Gordon I lost everything important to me, it's because of him I've lost the one thing that really mattered to me; the only family I've ever had. I tried to get my revenge on the man; I tried to act as karma, as chance. His son had the same chance as Rachel; 50/50, totally dependant on the flip of a coin and chance didn't give a damn if he made it or not. But then Batman turned up and stopped me and to this day I don't know if I'm pleased if he did or not.
Would taking Jimmy Gordon's life have comforted me a little inside? Would I have felt any better about Rachel's death if I took his life? Probably not. But then again it's not about what I want it's about what right and what's fair! It's not me who decides to kill either; I don't make these decisions; chance does, and chance is the only morality in a cruel world; unbiased, unprejudiced; fair.