Imagine that you had grown up on a plantation in the South, and all you had ever known was this life. Your entire family worked this plantation for generations, and maybe they even treated their slaves well, relatively speaking. If an abolitionist stepped on your front porch one day and told you that all your life was built on the great of evil of the time, you would be infuriated. After all, this is everything you know and love. Your wonderful parents and grandparents, your brothers and sisters, all of them are good people; they even treat their slaves well. Clearly, you would think, this abolitionist is making too much of the 'evil' of slavery. After all, it may not be a perfect system, but how else are we to maintain the plantation?
You would have an emotional reaction, instead of an intellectual reaction. As soon as the intellect is even slightly engaged in the abolitionist's arguments, emotions can take over to shield us from the guilt that we would feel about ourselves and our family and all that we stood for. We don't even like to be wrong about very little things, much less grave moral issues.
And so, it took years, and finally a horrific war that pit brother against brother, to revoke abolish the legal right to keep slaves. After the legal right was removed, it took another 100 years and a man named Martin Luther King, Jr., to help the black community receive the full rights that their dignity allowed them.
About 25-40% of women will have abortions in their life times.
To a great degree, our social system rests on the legality and availability of abortion.
Just as non-abolitionists had a vested interest in maintaining the slavery system, those who oppose fetal rights have a vested interest in maintaining our abortion system.