This may have been done because it was a true story and it was taken for granted that the audience was already familiar with the outcome.
I think that's the answer. People familiar with the story might otherwise be impatient waiting for the bank robbery stuff. By giving folks a taste of it right at the beginning, it's a way of saying "Hang in there with us--we're getting there".
Quite a few films NOT based on a true story have used a similar device of course, so by now, it's enough of a convention that I think it works well anyway, especially when a lot of the backstory is more "just a drama", but the film might overall appeal more to people who'd prefer something other than "just a drama"--like me. You get a sense for where it's headed so that you watch the dramatic backstory stuff with a different attitude.
http://www.rateyourmusic.com/~JrnlofEddieDeezenStudies
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