“And, of course, it’s not Mormons who are aborting.”
You know this how? Yes Mormons tend to have large families but only 74% of them saying it’s wrong? That tells me there are a few abortions in Mormon households that are unspoken.
It could be that some Mormons are all right with it as a civil law that they don't intend to use, but because mostly non-Mormons will abort.