Gep Malakai wrote:
^^Everything else the Joker told us about himself was a lie. Why assume he was telling the truth about not having plans? Lying to Harvey about not planning was part of the plan!
I don't think he had "a plan," per se. He had a motive, but I don't think there was ever any end goal for him. There was never going to be a point where the Joker wins. He wanted to fuck with Batman. He wanted to prove that all Good Guys (even the best, most incorruptible ones) have the capacity for evil. He wanted to show Batman that Gotham really wasn't worth saving.
But mostly, I think he just wanted to blow shit up and kill people. Why give the people on the ferries a choice when he was just going to blow them up anyway?