I know a Catholic moral theologian who do not believe there are any absolute moral norms. I heard him say so in a public gathering. I really, really don't get this, especially after Ven. John Paul II taught in Veritatis splendor that consequentialism and proportionalism are not acceptable Catholic modes of moral reasoning.
Although I know that many people abuse the idea of a consistent life ethic to justify not doing anything about abortion, there is a real sense in which there has to be a consistent life ethic. If a principle holds in abortion, it also holds in act of war: It is always wrong to intentionally take innocent human life, no matter what good is achieved by doing so.