Why do women get abortions? That data is all over the internet. Look here. Took about three minutes to find this from the Alan Guttmacher Institute, the research arm of Planned non-Parenthood.
https://www.guttmacher.org/sites/def...ls/3711005.pdf
But even asking the question is concerning. No one asks, "Why did that woman kill her six month old? Did she have a reason that was significant enough to allow for the taking of her child's life?" If you stop and think about it, your question is, for the most part, irrelevant.

