Answer: First, the correct way to write the sentence would be 'Reasons why people HAVE abortions'. Second, this is something that changes with each person. Some examples that are widely talked about now are r*pe, incest, and in order to save the woman's life. Also reasons such as, because it's the woman's body and she has the right over her own body.
(Please note that this answer is in no way meant to be political, I am just trying to answer the question.)
Explanation: N/A