Pro-lifers are like vintage comic collectors: it's phenomenally valuable until it comes out of the wrapper. After that - not interested.
Let the voices be heard of the parents (and let's face it, it's usually the mothers) who haven't had an unbroken night's sleep, or a weekend's break, or an unbruised body, or paid enough attention to their other children, in 10-15-20 years.
It's all very well saying that some people with SEN lead full and fulfilling lives. But the reality for their families is that life with a child with complex SEN is tough. Very tough.
But, really, what it boils down to is whether women should have the right to choose what happens to their bodies and to their lives.
*If it's how to respond to campaigners that you're asking, I'd stick with
'oh it's so complicated! I think women need to make their own choices!'
It's not wrong to say babies with disabilities deserve a chance, and it's not wrong to say women should have a choice.*
This is an acceptable response. Though I think I would not say "It's so complicated". The only person it is complicated for is the pregnant woman (and, possibly, her OH).