You know people who MAY have been killed by their abusive spouses

The risk of danger does not give you the right to dismember an innocent party. Also, if there is such a serious issue regarding the safety of the mother, the problem is not the baby. Sacificing innocent lives because of a poor abuse support system is not acceptable in any way, and there are many other ways to deal with such a situation. There may be thousands of reasons to have an abortion, but they are actually just thousands of bad reasons. These reasons always boil down to "I don't see this life as worthy of existing therefore I will kill it".