Nolan's or heaths joker brought to life who the joker really was in my opinion, the mirror to batman and Bruce, the embodiment of chaos, an anarchist, as Alfred said to Bruce, you cannot negotiate with some people, some people just want to watch the world burn and that is what is so terrifying about heath's joker ... He didn't want recompense, he didn't want freedom, or to right any wrongs, he didn't want a space of his own, or his own planet, he didn't want to rule, he didn't want a hug, or to be listened to, there was no angle you could engage with him or control him, he wanted nothing yet wanted to destroy everything. Well on the other hand, If he wanted anything, then it was to push buttons and watch what happened next.
For me anyway, this was probably the 1st time I've been mesmerised and truly terrified of a villain, one of the most outstanding portrayals of a fictional character I have ever seen.