[Peach]

This is in the Catholic Conference of Bishops official policy as linked earlier:

Since the best current medical opinion holds that persons in the persistent vegetative state (PVS) are incapable now or in the future of conscious, free human acts, these moralists conclude that, when careful diagnosis verifies this condition, it is not obligatory to prolong life by such interventions as a respirator, antibiotics, or medically assisted hydration and nutrition.

[The Old Hoosier]

Again, you are totally taking that graf out of context! The Church teaching is what I quoted above. What you quote is merely a discussion of some different theologians' views. In the very next paragraph, the views you quote are rejected:

While this rationale is convincing to some, it is not theologically conclusive and we are not persuaded by it. In fact, other theologians argue cogently that theological inquiry could lead one to a more carefully limited conclusion.

You did read it, didn't you? I hope you're just confused and you're not doing this on purpose to confuse people.