Proportionalism and Catholicism are natural enemies? In the aftermath of the Second Vatican Council, the idea of proportionalism made a resurgence (particularly among Catholics in the United States). While sustaining a whithering attack from both Catholic academics and from Pope John Paul II himself, the battle against proportionalist ethics is finding a new home among young Catholic graduate students influence strongly by JP II.
Interesting post from Acton, with some great articles linked.