I believe the Catholic Church is inconsistent in this one. Both in the way they argue and the conflict of the values they hold. The idea that live is to be preserved at all costs is actually a Buddhist concept rather than a Christian one. Buddhist oppose taking any life because you interrupt the cycle of Karma that will allow the person to progress toward Nirvana (the disappearance of self after all desire has been eliminated). after suffering in this life. In contrast, Christians understand that death is appointed for all of us and then we face the Judgement of Christ himself - who died for us to save us from sin. The imminence of death after a person commits a horrible crime like Rape, will urge that person to repent.