When You Reach Me question

Hey there! As any INSANE fan of this book would (at least I think...), I spent some time re-reading and figuring out some stuff, y'know, putting together the puzzle set up for us by the ingenious Rebecca Stead. I'm sure though, that, like me, you have a bunch of burning questions that I'm sure SOMEONE out there has an answer to.
So, post your questions and answer other people's inquiry, have fun, here's my question:

Why did the Laughing Man steal Jimmy's bank?

Feel free to (politely) counter any answers.