Why? If it's ok for you to discuss, of course.
It isn’t “just” because this particular case is super rare and scary that I would choose to eliminate those embroyos, it’s that I would have the option to prevent it.
Would I do the same for embryos with diabetes, poor eyesight or cosmetic defects? Probably not, those are pretty manageable.
I have no interest in having a child that requires extensive medical care and would prevent that if I had the option.