The primary justifications for assembly line baby killing are the health of women and children, to reduce child abuse/neglect inflicted upon "unwanted" children, to reduce the number of teen pregnancies, and to decrease illegitimate births (recognized as a major contributing factor in poverty & criminality).
Unfortunately, in the 50 years since RvW, none of those things have come to pass. In fact, just the opposite.
I also appreciate the pretense that an increase in education and access to contraception and abortion on demand will result in reduced teen pregnancy, disease, and abortion. Sex ed has been taught in the schools since 1968 (thank you Kinsey!) and contraceptives have been increasingly available to women and girls since the 1920s...now they are available in schools, at welfare offices, and of course at all health departments and family planning clinics, for free. So why has the teen birth rate, abortion rate, and unplanned pregnancy rate all continued to climb (with occasional, small blips every now and then)?