Yes, but doing it naturally and unconsciously makes it not evil

There can be no public sanity regarding anything that was done by people in the wrong side of fresh (historical) memory

Doing things unconsciously doesn't make them less evil, if anything it's worse.

Arguably the worst things are completely natural and unconscious.

Natural selection by itself is very brutal, and often slow process, and doesn't always optimize for traits you yourself find desirable.

As far as sexual selection is concerned, it is very often conscious.

In other words, there's nothing inherently wrong about eugenics.

The wrong part is coercing people doing or not doing things.

certainly, and you've chosen your blonde, blue-eyed partner attentively, but those traits are recessive, so when you find that your children will not have them you want to abort and try again.

slippery-sloping the ideas of control very quickly leads to nightmarish scenarios, of course slopes tend not to be slippery just because we fear they may be, but sometimes the slipperiness of a slope will seem not a problem until the right social movement comes along and takes advantage of it, best to be prepared is the pessimist's take.