I'm playing Devil's Advocate here but ....
Look, forget the 'science', and go with your intuition.
Life begins before birth, right? Virtually nobody disagrees with that.
Okay now MOST people belive that life, at least attached to a specific physical form, does NOT begin BEFORE birth. We're getting into philosophical territory here, but you rarely here the arguement that life begins BEFORE conception.
So we're down to a nine month 'window'.
Now, pre-mature births have grown into live humans after as little as five months of pregnancy. Not the usual case, but it happens. More to the point, no one disputes a life 'dies' at that point.
At some point between zero and nine months, we're talking about a baby, not a clump of cells.
Even if your motivation is as weak as 'why take chances?', opposing deliberately ending a pregnancy really IS as simple as 'save the babies'.
Unfortunately, inthe real world, it all too often also becomes 'enslave the pregnant women'.
I've always opposed Operation Rescue, but I have no trouble understanding them. 'Save the Babies' is simple and powerful.
Proud to be an American
Not blind. Not uninformed. We are party to atrocities. But the response of the world after 9/11 is worth noting. Even our most dire enemies offered aid. We should all be so lucky.