Basil, I don't think it is just a question of whether or not a woman wants an abortion, it is also why she wants to have an abortion.
Why did she want to have the sex that ended in a pregnancy? This leads back into the whole PIV as norm issue.
Why did she/her partner choose or not choose a particular form of contraception? How safe and reliable was it? How available was it?
Does she want an abortion because she doesn't have the means to support that child and nobody else will help her? What is the social context around women not having means to support children?
Does she want an abortion because she doesn't have the means to support a disabled child and nobody will help her? What is the social context of that?
Does she want an abortion because nobody will support a female child?
Does she want an abortion because the means of support for her other children will be removed?
Does she want an abortion because having a child will make her homeless?
Does she want an abortion because of the social stigma as a consequence of her being too young, too old, unmarried or having too many children already in the eyes of society or her husband or family?
Does she want an abortion because she was raped? What is society doing to end that?
Does she want an abortion because of inadequate health care for her and any baby she might have?
There will be some women who have abortions for good reason, but there will also be many women who want an abortion because a society has created negative conditions under which they became pregnant in the first place, and/or a society has created conditions under which it would be intolerable or impossible to raise a child, impacting on the mother, the child and other children she is responsible for already.