This argument is an attempt to shift responsibility from the person directly involved in the decision to have unprotected sex to those who decry what they perceive as a murderous act to shed that responsibility.
What if the argument is extended to a mother who gives birth but later decides children are too much of a responsibility and wants to shed herself of the child. Post birth abortion up to the age of legal personhood of the child (18 years in most states)? Or to simply abandon them to the state or private adoption of some kind?? If the latter, I think the parents should be taxed to pay some portion of the cost of raising the child by the state or private adopters.
“Post birth abortion up to the age of legal personhood of the child (18 years in most states)?”
Your premise is in error.
The Constitution recognizes citizenship at birth, which implies personhood. Not all citizens can vote, including minors.
Most states (38) recognize the personhood of unborn children because when they and their mothers are murdered, those responsible for the death of the babies can be charged with a homicide.