> I have no idea about Superman attacking, um, that guy you mentioned. The Joker wasn't really out of character. Jason's mother reminded the Joker about Batman seeking vengance after Joker beat Jason a few times with the crowbar, and the Joker then thought that he should get rid of the evidence so that there wouldn't be enough DIRECT evidence for Batman to connect the Joker to Jason's death.
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Except this wasn't a casual murder, this was the Joker killing ROBIN; His #1 foes' partner and synonymous with the word sidekick. Killing him should be one of the Joker's
proudest achievements, not one he'd try to cover up.
As he said in a 1980's Brave and the Bold story where he's framed for the murder of the Penguin; "If I HAD killed the little waterfowl, I wouldn't be trying to cover up my involvement, I'd be giving INTERVIEWS!".
True for the Penguin, and so much MORE true for Robin. He'd be gloating about this on TV stations, newspapers, and making Batman's life, already messed up by the death of Jason, even MORE of a chaotic mess. He'd be wanting to push Batman over the edge, just for a laugh.
Even the Joker himself ponders later that he should probably have had Robin stuffed as a trophy.