Define viable. Does healthy ever enter into it? Does life expectation? What I mean by that is that late term abortions, which are RARE by the way, are not performed for reasons other than the discovery, during that last trimester, that the fetus has a severe birth defect, often one that would make its life short and painful with zero hope of recovery.
You seem to have the very mistaken impression that women are having late term abortions out of convenience, because they were too stupid or mean or lazy to make that decision in the first trimester. Trust me, NO woman makes one of those rare late term decisions lightly, or just because she changed her mind at the last minute. It's about her survival, or the survival of the fetus.
To me, the bottom line is this: what another woman decides is HER business, and no one else's. Perhaps you should look to your own self, and stop judging the decisions of others.