Childbirth is widely recognized to be one of the most excruciatingly painful things a human can experience and often causes permanent damage or disability, on top of risk of psychological trauma and extreme depression or psychosis from rapid changes in hormones.
Anti abortion, pro-natalist, "traditional" types just pretend none of this exists and make up a version of reality where people giving birth will magically not be distressed or traumatized by, for example, needing their genitals ripped open and stitched back together, because childbirth is Natural and Supposed To Happen, so the pain, injury, and risk of disability or trauma don't "count" as those things in the same way they would if there was a violent accident.
Having listened to a lot of pro-lifers speak
I think some of these folks think women are automatically not going to be traumatized or feel horrified or really suffer in a fully human way, from pregnancy and childbirth, because that's what women are For.
And to accept that women can feel and perceive pregnancy and childbirth to be just as distressing and traumatizing as any equally excruciating, physically violating, potentially lethal or disabling event, would explode their entire worldview, because that's the Point of women, that's what a woman Is, a thing that is Supposed To do that.
So even if they are women themselves, they convince themselves that God/nature has miraculously made pregnancy and childbirth an Exception to typical human reactions to things.
So when somebody says "That sounds awful and I would do anything to stop that from happening to me." they think that this feeling will be erased by a magic cloud if the person actually got pregnant.
Acting like people aren't capable of feeling the full range of emotions about something because of their biology is really dehumanizing! Just because somebody has the capability to give birth, doesn't mean their minds cannot experience it as a nightmare, a torture, or a trauma.
It is the same horrid dehumanization of insisting that every woman will have a magic switch flip in her head that will throw every previous opinion in the garbage and make her want to have baby baby baby baby.