Because an unborn child is no different than a born child. Killing an unborn child is no different than killing a born child. You held the same human value while unborn as you hold now.
Given this knowledge… “you may as well kill newborns that will live in poverty, are born into families of abuse, born to teenage girls who are completely unable to raise a child or may have no one else to help. You may as well kill the newborns conceived from rape. After all, what about the quality of life for the newborn and the mother? Having a newborn that isn’t cared for isn’t saving anyone’s life.”
Your answer is to kill the children who find themselves in less than optimal situations. I was born and lived under less than optimal circumstances and I am glad that I wasn’t torn apart and tossed away while in the womb. Unfortunately, my sister was. She was aborted two years after I was born. She was a real human being and I will always hold her life and her memory in my heart. And I will always do what I can to protect other human beings like her from the slaughter of abortion. I will work to protect them from people like you.