On a basic psychological level you have a good point, however i'm gonna roll out ghandi on this one and call an eye for an eye, it depends on your view of justice as revenge, whereas now in a modern society, it's more based on rehabilitation and the fact that not every criminal is a complete dick. however you also have the paradigm of the perpetrator having human rights, you could argue that by violtaing someone elses, they waive the right to their own, but who's to say who does and doesn't deserve human rights. by giving that power you make the concept pointless, everyone has them or nobody has them.
It's an interesting point, but then what about the reformed? you have your body mutilated for a mistake you made, I know that not all offenders reform, but is it really worth ruining the extra lives for a greater sense of justice?
Do rapists got rights? answers on a postcard.