Mostly true in normal cases. If you’re really talented there is a market for you, always.
In this case, that market is the black market. In the regular market, no head of security wants to be responsible for a potential critical breach by hiring such a wild cannon.
His only possible path would have been to show remorse after the attacks. He shot that in the ass, or at least made his job much harder in that respect, by pulling another attack while in police custody.