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The point of the movie to me was that although Arthur isn't a hero, he's also not really a villain. It's difficult but not impossible to imagine he really could be in a relationship, hold down a job as a clown, take care of his mom and just be kind of unpleasant the whole time.
But instead things just don't happen that way, a couple random acts of cruelty prevent him from having any kind of life, and there isn't really even anyone at fault.
