For men explicitely fighting abortion rights the subjective rationality hides the true purpose which is the control of women’s sexuality – as if women were not able to “control” it exactly like men do.
The subjective rationality (point made by Raymond Boudon, French sociologist) : “we’ll save babies” hides the point : women should not be allowed to have sex with multiple men – and nothing else. With the hope of course that they will stay with them, and a total disdain for the (morally equivalent, on this stance) issue that men may have multiple partners as well. Eventually it signifies the deep association of sexuality with child making and thus rejection of sexualities that do not produce children, ie homosexualities.