Saletan fisks the Vatican. Ross gets this right:
I am bound to accept the Church's moral judgment that the taking of innocent human life at any stage from conception to natural death is a grave evil (and would not have become a Catholic if I did not), but that I am not bound to accept a Vatican document's summary of where the science stands regarding whether the morning-after pill does in fact take a life, by preventing implantation of a fertilized embryo.
The Vatican's inability and/or refusal to understand the science of procreation is something I deal with in great detail in The Conservative Soul.