Not saying I agree with him. Just that we are all entitled to our opinions. He's not the pope or the prime minister, so its just his opinion. No reason for outrage.
And that faced with a decision, should your DS or DD tell you their foetus has an abnormality, and asked for your opinion as to whether you should abort, where would you draw the line? It's a continuum from a non-viable foetus, with, say, no brain at all at one end to a foetus that has an increased risk of a mild impairment at the other.
It's an ethical debate.
In those shoes, should the foetus be Downs, my advice would be to abort the foetus. There will always be some children who need extra care from their parents, and who will never be able to live a full life as an independent adult. But not fair to knowingly bring one into the world.
Things you find stressful that other people don't notice.