Every state has the right to keep its own laws. If somebody has doubts whether those guys are guilty or not they should ask for reconsidering the court case in a supreme court but not to rewrite laws. Request to rewrite laws for the one specific case looks like admission of the guilt and asking for a more indulgent punishment.

I personally oppose death penalty worldwide. The world community should ask for rejecting death penalty other countries (all the countries but not the only one which is subjected to political pressure) but it should be done irrespectively to any specific court case.

As for sterilization it is an instrument to avoid undesirable pregnancy for a possible further victim. It is not a punishment at all.

Concerning the "criminality gen" I personally think it works vice versa. It is not the descendants who can commit crime but it is the ancestors who brought up and educated the criminal and they should be punished as well.