what better way to drive that point home than to take and kill hostages in a violent prison riot
it's like a time machine. if you go back in time and improve the prisoners' education and gave them the necessary support, it would permanently alter their timeline, they would become successful people in society, wouldn't get arrested for small crimes, wouldn't get released for small crimes and go commit the same crime again, then hold people hostage.
Go to the source of the problem and the problem won't exist anymore