I honestly don't see any cons in a voluntary abortion. If anyone can think of any legitimate ones, I might consider their argument.

If someone is a strict constructionist who interprets the Constitution word for word, the sanction for abortion is given under the Fourteenth Amendment.

The Fourteenth Amendment of our U.S. Constitution defines a citizen “a citizen” at birth. If a woman is carrying a fetus in the womb, the U.S. Constitution does not designate the fetus as “a citizen.” It would take an amendment to the U.S. Constitution to declare a fetus a citizen. You have to be born in order to be recognized as a citizen. Therefore, a woman does have the right to choose. A fetus inside the womb is not designated as a citizen according to the U.S. Constitution so by default is not entitled to life, liberty, or prosperity. You have to be born in order to be endowed with those privileges. To conclude, neither the Federal government nor any of the States can deny a woman the right to choose.

If abortion is murder, abortion would have been terminated years ago due to the cruel and unusual punishment clause under the Eighth Amendment. Again, proof that a fetus is not recognized as a citizen of the United States of America.