Ba’avod Reshaim Rina only applies to נתמלא סאתם, when they are full-fledged, through and through evil. Even then, if you have the choice you should obviously choose to daven that they repent.
Even someone deserving מיתה deserves compassion. ברור לו מיתה יפה. They do everything to minimize the suffering. They also fast. Torture is never an option.
The way prisoners are abused in this country is despicable. It is hard to rally for this cause, since people have this notion that once someone earned his way into jail he deserves absolutely anything that comes his way, and only hard bread every day.