Why is this rational? A great deal of the deterrent value of a criminal justice system consists in telling stories. If you simply state the facts, they might be much less deterring. Thus "they are going to lock him away and feed and house him for free for the next ten years," might look more like an additional benefit than a deterrent.
I believe you're missing the point. Saying "He is going to pay his debt to society," does not tell you much of anything unless you know all the context. Because the person who says it often does not want to inform you so much as they want to influence you or someone else.
Another month, another rationality quotes thread. The rules are:
EDIT: I haven't posted a monthly thread for October and November, since people haven't been posting many quotes and some people have said a monthly frequency might be too high. I'll make them quarterly instead. I should actually have made a new thread for October-December, but I'll leave it like this since people have been posting in it this month.