In our day, sanctity-of-life issues are foundational — not because of anyone’s ‘religious’ views about abortion…but because the act of dehumanizing and killing the unborn child attacks human dignity in a uniquely grave way. Deliberately killing the innocent is always, inexcusably wrong. It sets a pattern of contempt for every other aspect of human dignity. In redefining when human life begins and what is and isn’t a human person, the logic behind permissive abortion makes all human rights politically contingent… Indeed, the failure to protect and defend life in its most vulnerable stages renders suspect any claims to the ‘rightness’ of positions in other matters affecting the poorest and least powerful of the human community. If we understand the human person as ‘the temple of the Holy Spirit’ — the living house of God — then these latter issues fall logically into place as the crossbeams and walls of that house. All direct attacks on innocent human life, such as abortion and euthanasia, strike at the house’s foundation.
Archbishop Charles J. Chaput, Render Unto Caesar: Serving the Nation by Living Our Catholic Beliefs in Political Life