I know that bragging on the open about your past criminal activities do not really makes a lot of sense to us, but a great deal of criminals are caught precisely because they cannot keep quiet about what they did and they want to share their stories with others, then eventually one of those persons that heard the story get in trouble and they use the information they know to try to reduce or completely eliminate any charges that may have come their way.
Well, I'd reckon most folks ain't got criminal minds. The reasons criminals do stuff can be kinda screwy and, well, pretty dumb. For some outlaws showin' off is like a twisted trophy or a way to impress their "crew." its almost like their brains are wired different, not carin' 'bout right and wrong. Like what happened to the OP in this story. Just doin' the crime wasnt enough no more - he had to shoot his mouth off 'bout it just to feel that rush again. Addicts chase that next fix the same way.
For what I know criminals are indeed wired differently than a common person, basically most criminals cannot think long term at all, so when they imagine themselves stealing something, they can only see as far as them getting the money they desired so much, but they cannot see themselves getting investigated, arrested, getting a criminal record, not being able to get any regular job because of their past criminal activities, losing the love of their life or even their freedom because of their actions, which in a way explains why they are willing to share the stories of their previous crimes with others.