Since when is birth control preventive health care? Getting your teeth cleaned and washing your hands are preventive health care. You use an external means to ward off disease. But by saying birth control is "preventative" one is putting it in the same category as a disease. May God have mercy on us all.
On another note, if the protestants would have not moved away from Orthodoxy to approving birth control, there would be more people to stand with the tradition of honoring the nature of the human person to be open to procreation. For the sake of ecumenicism, the Catholics never complain to the protestants about how they have contributed to the secular mindset. Maybe we should correct them as much as we do the rationalists and secularists? It isn't working to play nice, obviously. The conversions are not coming. Catholics need to be more evangelistic to the evangelicals.