>Maybe a “Hunger Games Scenario” (shills forced to fight each other to earn their survival) is the optimal punishment.
put 'em up against a wall and shoot them
bulldoze their wretched remains into a pit and bury them
your "Hunger Games" scenario just trains them and the end result is that a few of them are much more dangerous than the were to begin with…
just line 'em up against a wall and shoot 'em
quick, efficient & cheap