"More acceptable" is debatable.
Clearly to many anti-choicers, they do not care about actual lives, just the idea of "babies being innocent and sacred." A lot of this comes down to religion. On top of that, MOST anti-choicers actually just enjoy the control they have over these people, and use the last thing I said as an excuse to hide that fact. They allow 13 year assault victims to give birth just to have a premature, likely disabled baby afterwards.
In this way, their hatred for suicide AND abortion isn't about taboo, but CONTROL. They control who lives, who dies, who suffers, what is "worth it."
As for those who are pro-choice, the idea is that a fetus is more POTENTIAL life than life itself. Yes, it is technically living, but no pro-choicers will encourage abortions on extremely developed fetuses unless said baby will not survive long term (ancephaly I think was the term for a common situation where that happens?).
Fetuses are living, sure, but they lack the ability to live freely without the uterus they reside in. Even while in this uterus, many fail to thrive, or the umbilical cord gets wrapped around their neck. The person who would have to give birth to them is already living freely, but may LOSE the ability to if disabled or killed by the birthing process. You can go blind, deaf, my own mother got heart failure from my pregnancy.
The idea is... why take someone's freedom to live just to give it to a fetus that already might lose it whether it's aborted or not? And even if said fetus stays healthy the whole time, is it worth it to sacrifice the birthgiver's mental/physical health for that (not to mention what happens to the baby AFTER).
This is how this ties into suicide. Pro-choicers value life. Life that is often seen by them (ironically) in a black and white way. They can't see the hypocrisy behind it.
I've always said, I don't like the idea of abortion, but it's currently the only option that spares both the birthgiver AND the potential baby suffering (especially with the adoption system how it is).
It's the same with suicide. With how fucked up our mental and physical health system is, in some places people literally cannot get help and healing. It's just impossible. Asking them to wait is like asking a person with an incurable disease to wait to see if scientists will find a cure. The person suffers in the meantime as cures aren't created fast enough. The mental/physical health system cannot be fixed fast enough to help some people in places that have next to no access.
Why make them sit and die slowly? Why make them suffer? Why make them take their life in a horrifically unplanned and gruesome way just because no one will help them live OR die?