Programs of mass sterilization and mass murder require the state. Eugenics does not require mass sterilization or mass murder, only encouraging good DNA to be spread and/or discouraging the spread of bad DNA.
If a married couple wants to have children, but the man is sterile, and they choose to have a baby by implanting sperm in the wife from a sperm bank, and she chooses sperm from a rich, smart, psychologically and physically healthy man, she is practicing Eugenics. And that's a good thing, because her child will almost certainly grow up to be healthy, smart, and rich.
Eugenics is simply man's taking a direct interest in and artificially speeding-up evolution.
Uhm, as of 2002 forced sterilization is not illegal in this country on a federal level, rather it is not being practiced as eugenics has fallen out of favor. And it is not the times when a dangerous matter is unpopular one should be worried about, rather it is the times when an idea is popular when it may be dangerous.
Eugenics is America's best kept secret.