This is the most appropriate response so far. Condoning violence on someone serving their sentence is kind of fucked. If death were an option, many people would opt for it and this just shows how little people grasp the severity of time is as a punishment.
After approximately two years, people start to lose the ability to live a normal life. They end up becoming institutionalized and only being able to live in a prison facility.
This helps nobody. This does not rehabilitate, teach, or forgive. You can’t get back what was lost, but you can promote growth, or feed hate I suppose. Hate breeds more hate though.