The thousands of women rendered sterile or dead, the doctors stripped of their practices and jailed, the untold numbers of abandoned infants, the fact that only the rich had ready access to a safe abortion, the orphanages, the shame of out of wedlock births, the lack of reproductive choice for women and many other considerations. To those who do not remember the old days it is difficult to identify with why abortion was legalized or why it was ever illegal.
As opposed to millions of lives being lost? The interesting history about abandoned infants is that this was one way to help insure survival among both mother and child during depressed economic times. In our times, little interest is given to survival of the child. The issue is not just to support the survival of the mother today, the issue often involves not inconveniencing the mother.
I doubt it can be argued that the loss of millions of children was the less harmful option for society. That being said, no matter how society has tried to handle the problem of unwanted pregnancies, there have always been unintended consequences. For example, early on in the Catholic Church it was a matter of honor not to have sex outside of marriage. The unintended consequence was that an out-of-wedlock pregnancy brought shame not only on the girl, but on the families. In early America, non-Catholic families decided that unwanted children would be raised by the entire community--which put a burden on small, poor communities. So an entire community was not burdened with these children, orphanages came into vogue. Children often did not thrive in orphanages which brings about foster care, where again everyone's tax dollars are paying for the care of unwanted children.
Down through the ages unwanted children have ever been a problem. I don't think society has solved this problem with abortion. What is the solution? Or is there one?