The ideological reasons forged in order to "legitimize" Nazism and abortion do not resort to the same formulation, but they have this in common: They "legitimize" absolutely arbitrary discrimination among human beings.
Whence the points common to the ideologues of genocide and the promoters of abortion: In both cases the victim is not recognized as a human being, and in both cases the victim is innocent.
And to that we must add the fact that, if we are to believe the statistics of the W.H.O., the annual victims of abortions are incomparably more numerous that the victims of Nazi genocide.