Abortions almost entirely come from unwanted pregnencies. Both parties know this so they offer different solutions on how to reduce unwanted pregnencies.
Disclaimer: I refer to "pro lifers" as "opponents of Roe V Wade" because they aren't pro life for every life usually and I refer to "pro choicers" as supporters of Roe V Wade because they aren't pro choice for every choice usually.
The pro Roe V Wade solution is to make contraception free. The left cares more about reducing unwanted pregnencies than they do about reducing abortions, but they are fine with reducing abortions if it results in less unwanted pregnencies and they have realized that free contraception reduces both unwanted pregnencies and abortions.
The anti Roe V Wade solution to reduce unwanted pregnencies is just to not have sex. This advice is so bad that not even most people that oppose Roe V Wade follow their own advice. 97% of Americans don't "wait until marriage" and this includes at least 94% of people that oppose Roe V Wade. Most people that oppose Roe V Wade don't follow their own advice.
Now consider the following scnaraeao: Lets say a white person wants to enslave a black person for 9 months in order to save his life (kind of like how an unwanted fetus requires the slavery of a female for 9 months to save their life). Would this be morally acceptable? No; it would not be. The 13th amendment makes Roe V Wade the law because slavery (even to save the life of a white person or a fetus) is unconstitutional.
But opponents of Roe V Wade would argue that the slavery and the unwanted pain from pregnency are morally acceptable to save a child. However, if I were to ask many of these anti Roe V Wade people if it would be morally acceptable to vastectomize every male, freeze his sperm, and if he ever wants kids, he uses some of the sperm that was frozen to get the kid (all assuming the female consents to be impregnanted), they would claim it's a violation of their freedom.
This view to me makes no sense. You think forced vastectomies to save a child's life are tyrannical, but that forced childbirth to save a child's life is morally acceptable? I'm pretty sure the vastectomy is significantly less of a sacrifice and it achieves the same goal. In addition, nobody is arguing that an unwanted pregnency is beneficial for the female that has it. But I can argue that vasectomizing all men and freezing their sperm when they want to have kids produces long term benefits for the men that get them. For example, now they don't have to worry about pregnency, so assuming they and their partner get tested for STIs and it's proven they don't have any STIs, they can have significantly more consensual sex and not have to worry about unwanted pregnency.
The main reasons why I encourage abstinence is because of the fear of unwanted pregnencies and the fear of STIs. However, with a vastectomy, the first fear becomes obsolete, and with STI testing and treatment when applicable, the 2nd fear also becomes obsolete. At this point, some benefits to unprotected sex are below: