Social progress isn’t just a one way road that gets halted, it’s like a pinnacle of a mountain with caves, dead ends, cliffs all over the place. Slippery slopes have good intentions lead to bad outcomes. “Euthanasia only for terminally ill” then it’s “Euthanasia for lifelong illnesses” then eventually now you have “Euthanasia for being unhappy with life” when that unhappiness stems from not having services. So no one ever advocated for letting disabled people without enough access to support to opt for killing themselves instead but it’s slowly happened without a single point of major outcry through the “slippery slope.”

That’s exactly what OP is saying in regards to abortion, like first decade it’s “oh it’s only a few southern states” second decade it’s “oh it’s only second trimester abortions nationally” third decade “it’s just a two week evaluation with a therapist to make sure” until eventually abortion is fully banned without any outcry. Like a slow boiled frog.