We don't have good indications of problems with third trimester abortions. We have big problems with politicians trying to backdoor ban abortions. Thus, while in general I agree with you (but I would put the dividing line at 7 months) in practice I would prefer an absolute line that the politicians can't touch it.
I'm open to some reasonable negotiation about where to place that line. But like you, I do think there should
be a line. And politicians should, in my view, have no investment in that line - it's sole purpose is to define the stage at which a fetus is considered to be a human life rather than a lump of cells. For anything before that line, the government is prohibited from interfering, and the decision is entirely up to the mother (and whoever she decides to take advice from). After that line, the government still doesn't get a say, but it does need to be medically justified.
That later period termination would be similar in concept to assisted suicide. A ban on late period terminations would make it so that any doctor and mother having that abortion would be considered to have committed murder. Similarly, if assisted suicide is banned, any doctor who helps a patient end their life is considered to have committed murder. Limitations on late gestation terminations would do nothing more than require that there's a medical justification for it - if there is no medical justification then it is tantamount to murder. Likewise, when assisted suicide is not banned, it still requires medical justification - if there's no solid medical reason for a doctor to euthanize a patient then it's just plain murder, even if the patient really wants to die.
I see these two situations as very similar.
So to the rest of the thread participants, I have two questions:
1) A healthy person with no terminal illness and no significant pain comes into a doctor's office and says "hey doc, I don't want to live anymore". The doc says "alrighty then" and pumps them full of fentanyl until they overdose. Do you consider this to be murder?
2) A healthy mother comes into the doctor with a healthy fetus at 8.5 months into a pregnancy, there's no risk to the mother's health or wellbeing, there's no deformity or health risk for the infant. Mom says "Doc, I changed my mind, I don't want to have a baby anymore". Doc says "No problemo" and aborts the infant. Do you consider this to be murder?
If you gave different answers to those two questions... what do think makes them meaningfully different?