Scientists in most of the non-fanatical world had already rejected eugenics as a flawed concept before the Nazis came to power. It's just not statistically or theoretically valid. It certainly wouldn't have been supported after the development of population genetics.Of course, the climax was the Nazi fascination with eugenics and the subsequent racist and genocidal implications that went along with it. This pretty much put the nail in the eugenic coffin. Had it not been for this I'm pretty sure scientist would still be promoting it.
There is something of a difference between aborting a fetus that will face debilitating mental or physical disabilities--or those that will likely die shortly after birth due to untreatable genetic conditions--and a systematic program to redirect human evolution. Eugenics goes quite a lot further than simply working to eliminate inherently and undoubtedly debilitating genetic errors from the gene pool. There's a huge difference between aborting a fetus with, say, Tay-Sachs disease and proposing a systematic campaign to eliminate all black people because their skin color is deemed inferior.In fact, society still promotes in via abortion. If your unborn child is "defective" then in the garbage he or she goes.