Suicide of pregnant woman is preventable

IT perplexes me that any rational person can support the view that a woman who has threatened suicide should be entitled to an abortion.

How can it be argued that pregnancy is the primary issue which ought to be addressed, and not any other underlying issue such as a history of depression, mental illness, or other personal circumstances?

To my knowledge, medical science has not discovered any inherent link between pregnancy and the sudden onset of suicidal thoughts.