Eugenics are not evil and would rid the world of many terrible, terrible hereditary diseases. However, the way to get it out of humanity should be done by the 'soft' way, not with violence.
I understood eugenics to be defined by a push to get desired people to reproduce more and undesirable ones to reproduce less? This seems quite different to things like gene testing and embryo selection which aren't as easily abused.
Those things are equivalent, only in the first case you do it retroactively instead of proactively. Hell, if gene modification becomes advanced enough you could even let people with hereditary diseases just reproduce and 'edit' the created embryo so it doesn't have said hereditary genes.
It's not quite like this but people with Huntingdon's can have embryos tested and healthy ones implanted so that their kids don't have Huntingdon's. This Nature article describes the process in 2002. www.nature.com/ejhg/journal/v10/n10/full/5200865a.html