To abort or not to abort

[Heywood]

There is a moral obligation to take reasonable care of the unborn.

But you said

That does not mean we need to go out of our way to insure its survival.

I can see how you would view that as a bit of a contradiction. Going out of our way to insure the survival of a zygote would be like assuming for days after sex a posture conducive to implantation. Zygotes don't need our help to implant.