What we have here is a failure to comprehend the meaning of the phrase "proportionate reasons". This misunderstanding colors not only this specific issue (preterm induction of infants with life threatening anomalies) but other issues. Say, for example, the Ratzinger letter that has been misinterpreted to say that it is morally licit to support the election of pro-abortion politicians.
Isn't there a heresy known as proportionalism?