The trimester system is also obviously completely arbitrary. The court decided that the fetus is basically just a part of the mother's body before the third trimester, with zero personhood. I hate these sorts of arbitrary lines which nobody will ever agree on. Conservatives believe that Roe allows for murder, and some liberals think that Roe didn't go far enough, allowing mothers' rights to be infringed via abortion restrictions in the third trimester.
the trimester system is a valid system as it has 3 phases that fit actual biology and science
the first 12 weeks(3months) first trimester is where a pregnancy is most likely to not progress into an actual birth. the miscarriage rate is high in the first trimester. the risk of fetal abnormalities occur mostly in this trimester, its why women dont like to tell alot of people they are pregnant until they get passed this risky timeperiod threshold.
the start of the 3rd trimester is the point at which the fetus, if born prematurely or via emergency c-section has a chance of survival.. where as before this point it is considered not viable to survive outside the mother.
so upto the point of the end of the second trimester means the mother is in full control of the life support of the fetus, where there is no independence of the fetus without the mother. the mother is in full authority of the life support.. because SHE IS THE LIFE SUPPORT...
and just like being a medical proxy/next of kin for someone in a coma on machine life support ventilator, the family with the power of medical decisions about interventions or DNR has the power to choose what is right or best on behalf of those on life support where they wont survive without that particular life support
its her body, her decision.
after the third trimester. there could be options of c-section then put it up for adoption or continue pregnancy and put up for adoption..
but that option is not available in the first 6 months. the only option is abortion if she chooses that she doesnt want her body to have a baby (for many reasons)
its not murder if the fetus wouldnt live without the mother anyway.
just like DNR and switching off mechanical life support machines is not murder for people that are in coma/brain dead