I'm not entirely certain but I do lean towards the Nolan version of the Joker as ILE, he isn't as image orientated as Burton's, it came across as more for his own self-amusement. Also the games he played with the bombs on the boats and the Harvey/Rachel kidnapping came across as Ne+Ti gone bad; he wanted to fuel his own sick curiosity into human behavior while simultaneously having no regard or understanding of, it was all about "how will this work"
btw, for a real life example of this see Josef Mengele


, it was all about "how will this work" 


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