Let's try something a little more intellectual: there's also the aspect that eugenics is an idea directed to the improvement of humanity (an idea I'm... suspicious of) and abortions are decision by individuals reflecting individual circumstance. I don't believe these decisions are made on the eugenics basis: that disabled people are somehow worse than other people.

Eugenics is relatively easy to judge: you can get all the facts. Individual decisions are always harder: you don't know the full circumstance. I'm not saying that their aren't abortions made for obscene reasons (terminating girls is an obvious example), but not all are.