Because women are not walking incubators. Women are human beings with the freedom to choose what is right for their life and their body. Because making abortions illegal is basically saying to half the population we don't care about your health or well-being we just want to control you and make you feel powerless so that we can feel more powerful.
If the fetus us part of your life and body then
Does the woman lose part of her body at birth?
Does she become handicapped after the fetus leaves her body at birth?
Why wasnt she born with it?
Wouldnt this make abortion self mutilation?
Why does it take a man to to put it there?
As for the world not caring statement, I believe it is quiet opposite. You are taking that potential life, as many would call the baby, and say even though you are human I am more powerful and I dont care. The Bureau of Vital Statics of the U.S. Public Health Department reported that in 1968, only a few years before abortion was legalized, 130 women died from illegal abortions. Yet between 1972 and 1985, when abortion was legal, 193 woman died from illegal abortions.