As I said, it's a mistake to think that everyone in America knows that The Joker is a Batman Villain, let alone that they know Heath Ledger's incarnation. There are plenty of people who do not follow comic books and do not go see comic book movies. Unless you have that context I would assume that a racoial angle would be the first think you think of. That said, even with that background if in the time it took to repaint his face the potential racial implication *never* occurred to him, then the artist is likely kinda slow, or suffering from Asperger's or some other condition that makes it hard for him to imagine the reactions of others. I recall the series of images comparing Bush to a chimp. I can imagine someone redoing that to criticize Obama. I cannot imagine that they would not think abouyt the potential racial implications at all during the process, even if the Bush images were their initial motivation., unless they were (in this hypothetical case) severely mentally impaired. Same thing with The Joker poster, though a more mild mental impairment would explain it for me.