I don’t know if that’s exactly what she was arguing. Rather, it seems that, in the case of ambiguity (that is, if the mother isn’t sure whether Tom, Dick, or Harry is her baby’s daddy), then traditionally it has been the mother’s prerogative to point to one or the other of them and say, “you’re the father.” I think that she’s saying that, with the advent of DNA, the mother’s ability to do so has been taken away to some extent.
To take the next step, as she does, and call paternity tests “anti-feminist appliance of science”, takes a certain perspective; on its face, the claim is nonsensical – science is neither feminist nor anti-feminist, although those who use the technology that science brings us may fall into those pigeonholes. However, she does have a point when she asserts that “a change in the balance of power between the sexes” is the end result: whereas women used to be able to claim, “no, the baby is my husband’s, not this other guy’s”, now that claim can be assessed for its truth value. McDonagh bemoans the fact that accurate knowledge of paternity leads to “misery, recrimination and guilt.” Yet, it’s not DNA tests that have led to these unfortunate results, and McDonagh makes herself look foolish in asserting so. Rather, “misery, recrimination and guilt” are the direct result of adultery and extra-marital intercourse. If McDonagh wants to paint a villain, it is these human behaviors, and not technology, that deserve her attention.
I’m not certain that “men do not have the right to know” is exactly the point she’s attempting to make. To tell you the truth, she raises some valid issues. I think McDonagh is pointing out that some men may wish to use paternity tests as a means to justify the termination of their relationships with women who have cheated on them. Keep in mind that the Catholic Church does not require the innocent spouse to leave the marriage, although there are provisions allowing him/her to do so. So, suppose there was a woman – a wife and mother – who makes a mistake, gets pregnant doing so, and repents. She doesn’t tell anyone who the father of her baby is. Suppose further that her husband suspects infidelity. Where does the greater justice lie? In a revelation of the truth that provides him with ‘justification’ for severing the marriage and depriving his children of a two-parent household, or in the truth remaining secret and the marital household remaining intact? It’s a good question…