After thirty years, it is ingrained. It'll start with something small like, even though he has the money to pay for something in his pocket, he'll steal something from a store. He'll start a fight for some stupid remark and beat the guy half to death. He'll get drunk and order a pizza and then rob the delivery man because he was late.
He is unable to function as a free man in society. This has nothing to do with education, intelligence or, willpower. It is a fact of long time imprisonment.
But, he didn't do any of these things to begin with...he wasn't a criminal when he went in. Why would he rob a store when he got out?
