My point is, what's a better society is not an objective judgment. It depends on what you think is good, what your ideal society is. I'm sure we'd agree on this or that superficially, but without us agreeing on fundamental values, there's no point in discussing actions. As an extreme example, if I believe that ultimate elimination of sexes from the human species would be a good thing, where would we start debating? Certainly on the desired results, and whether they themselves are good according to our respective values. Ordinary examples are a lot more subtle and convoluted though...
Two things here. First, even if we shared the same goals, we still wouldn't know what's best, we don't have the science. Second, we don't share the same goals.
We could judge if the abortion is justified in case by case basis, but there are many leaps one needs to take in order to accept that these cases are "less" justified than other elective abortion cases.