[R0b0t1]

I've thought about that one a lot and I think it is the real intention. The admitted purpose of punishment in the legal system is punishment, not rehabilitation. That is something that can be change, but until it is, only punishments both cruel and unusual are prohibited. Unusual but not cruel punishments allow for flexibility like forcing someone to write a paper or read a book. Other punishments, like putting someone in a cage, are necessarily cruel.