It is morally acceptable. Even in the abolitionist movement, there were debates on how best to move forward. Some felt a gradual approach would work, some wanted full abolition now. In fact, Lincoln himself was originally in favor of a more gradual approach (stopping the spread of slavery). It wasn’t until the middle of the Civil War that full emancipation was thought to be prudent (and primarily to help win the war, btw). Just think of it this way - PP wants NO restrictions on abortions, EVER. Would they have gone out of their way to temporarily block passage of TX’s version of the Pain-Capable Unborn Child Act if they didn’t think that the intent was to nickle and dime away “abortion ‘rights’” until there were no more abortions? Of course not.
One of the stated goals of the pro-life movement is to make abortion something that never ever happens for any reason. And of course, there is more to the pro-life movement than just being against abortion, as there are so many different threats on the dignity of life in the US that we have to take a multi-pronged approach. Why? Because if people can’t see the dignity in people that have been born (especially those on the sidelines of society - people with disabilities, the homeless, people who are dying), they won’t see dignity in the unborn - and vice versa. If people can’t see the dignity in themselves, they won’t see the dignity in the babies they are carrying - and vice versa. If we are to be pro-life, we must be authentically pro-life. Otherwise, we get lambasted with all different accusations, including (and yes, I’ve heard this one before) “You are against abortions so that you can send more people to war.” Seriously. I’ve heard it. Be pro-life - and don’t let the perfect be the enemy of the good. If even one baby can be saved by a piece of pro-life legislation, it’s a good thing. We must not cut off our noses to spite our faces, just because something’s not perfect. If we do that, we’ve accepted the status quo.