Heavy spoilers for Justice League #50.
Why does the real identity of the Joker matter ? If Batman knew it, would it be more effective at stopping him ?
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Knowing who the Joker really is has the potential to provide these advantages:
The Joker is Batman's greatest enemy and the one we know the least about. The idea of getting the chance to flesh out a character that has been around since 1940 has the potential to be very interesting.
People latch on to characters they love, craving as much knowledge/understanding about those characters as they can. They want new stories, new character wrinkles, and new reasons to fall in love with the characters all over again. This is the nature of storytelling.
Learning that the Joker has potentially been 3 different people over time is one heck of a twist, right?