There's a reason access to 3rd trimester abortions enjoys far less support from the public than abortion rights in the abstract—and, in fact, IIRC, Roe and subsequent decisions do not guarantee any kind of right to 3rd-trimester abortions, which is why states have been able to restrict abortion access for late-term pregnancies, despite Roe.
Just seems wrong that you think that the mother could kill it up to the last moment of birth, for even the most absurd reasons.