Problem is the idea that you would terminate a pg if you discovered ds gets perpetuated by the fact many people have never met anyone with ds.
And by the fact these tests are seen as routine and that of course you want the test, and of course you want to find out, and of course you'll risk an amniocentesis, and of course you will terminate.
With both dds I went for a nuchal test, just as a possible indicator. With dd2 you were only supposed to be 'allowed' to have the nuchal if you had the blood test as well. I just told them after the nuchal that I'd decided against the blood test after all.
I knew I wouldn't risk an amniocentesis. I was 43 and had had 5 miscarriages before dd1, no way would I risk possibly my last chance of a child. Plus dh and I had already decided we could not terminate, because of what we'd gone through in the past.
There are so many things, many of them more disabling, that your child may have or develop. The tests almost seem to suggest that if it's all clear your baby will be 'normal' - not so. If you have a child you have to consider if you will love them whatever happens, and in all circumstances.
After I had dd2 I was lucky enough to meet my first ds baby. I offered to hold a bouncing 18 month old boy while his dad sat in the dentist's chair. He was an absolute joy, and he was just like my own toddler. We played and I pointed to things and he looked and we laughed - I never realised it would be so like holding any other baby.
My reasoning during pg had been all hypothetical. But I'm sure if I'd had the chance to meet babies, children, adults with ds, not just as a passer-by but in my everday life the possibility of even considering a termination would seem totally strange. And I hope in a few decades time it will be seen as 'odd' to have the test - for the purpose of termination - rather than 'odd' not to.