Well, you're right, I digress.
The goal of anti-abortionists is to ban abortion completely, isn't it?
On this logic, no pro-choicer should ever compromise with them, because they are never willing to accept a compromise with pro-choice forces, it's all a salami-tactic down to a ban on abortion, forever.
But there is no movement afoot for an all-out ban on piercings or medicine. So why even make the comparison?
However, you are correct that the goal of the pro-life movement is a ban on abortion, forever (possibly excepting life-of-the-mother cases). And, no, we don't want a compromise that allows anyone to be murdered. Not even a little bit.