Yes. I don't think it was the right or even a fair choice. My Mum was diagnosed with a serious cancer at the same sort of time they realised she was pregnant. She in particular so wanted children and, they had been told it was a 'medical impossibility'.
I suppose I can understand she didn't want to then kill the thing she'd always wanted (with chemo.) But, I do wish she'd focussed on her own health. My Dad tries to reassure me, it still wouldn't have saved her but, I don't know. It feels like an effort to allay my survivor's guilt (type of feeling.)
Still, I'm not sure they really thought through how everyone's life would change if she died- which she did. I also don't really think they thought much about the genes they would pass on and how a child with them would fit into this world. Not that it was as bad back then I suppose.
Really though- I'm an anti-natilist at heart now. I tend to think any parent exposes their child to an unreasonable amount of risk- that literally can't be mitigated sometimes. A friend's child has suffered horribly with their health already. No matter if they are the best parent in the world- there's certain things we simply can't protect people from.
So, I have maybe the more extreme view that parents ars always to blame. No matter how good their intentions were or, how good their parenting was. The world itself isn't safe for a sentient being to be in.