At least when a ganger beats someone up for 'dissing him' there's a logic to bragging about it, the crime was part of a greater motivation to be feared and respected and that requires advertising. Ditto, someone forgetting to wear gloves during a robbery is guilty of "Stupidity by Oversight" and dumb things during a crime can be partially excused by a need to rush or fear, adrenaline, and anxiety clouding thought.

These are like taking an ad out in the newspaper "I, Jon Smith of 314 Pie Ave, engaged in aggravated assault yesterday afternoon on a homeless man in Grove Park, using a baseball bat in my trunk."

Though it does strike me as a great way to frame someone.