Neither Congress or any state legislatures tell car owners how often they must change their oil or
rotate their tires or replace their transmission. And, they don't pass laws regulating what tools mechanics must use or instruct them as to exactly how to do their jobs.
Neither Congress or any state legislatures tell apple growers when to prune their trees or spray their dormant oil or pick their crop. And, they don't make laws regulating methods of grafting or fertilization.
Why?
Well, maybe they acknowledge that legislatures should not attempt to micromanage decisions best made by those the decisions will impact personally and seriously. Stated another way, they have declined to stick their partisan legislative noses into affairs that do not concern them.
What in the world persuades some of them that they may not know carburetors and they may not know blossom end rot from scab, but they sure as hell understand the infinitely more complex female reproductive system and the effect of an unwanted pregnancy on the physical, emotional and financial well-being of a woman and her family?