The good ones are already doing consulting work for the cops, FBI, military, intelligence, etc. There are countless books and movies and news reports about this, from organized crime informants, document forgers, computer/network hackers, international espionage, heist masterminds... the list goes on and on.
The majority of crooks - the 'ex-cons' you're talking about - are just shitty petty criminals or violent idiots, and get caught and punished. Why would anyone hire a shitty crook to do counter-intel against a job they failed at previously?
The majority of crooks - the 'ex-cons' you're talking about - are just shitty petty criminals or violent idiots, and get caught and punished. Why would anyone hire a shitty crook to do counter-intel against a job they failed at previously?