It isn't so difficult to figure out; all that is required is a widespread, power-backed propaganda campaign insisting that certain persons are "less than"; that their humanity is in some way subservient to the "needs" of others.
We are not so holy.
We have not so completely repudiated Adolf's atrocities as to cut ourselves off from indulging in atrocities of our own. Indeed, in our own time, we have surpassed even Hitler's greatest hopes for success in removing "the least of these" from among the midst of his countrymen. Hitler destroyed millions; we have destroyed tens of millions.
We have so successfully waged a holocaust of our own that the flood tide of blood has risen to our very necks. It swirls about us and cries out for justice to the very Throne of Heaven, and to him that sits upon it.
Compared to us, Adolf Hitler was small-time.
Be assured of this: Hitler himself will arise at The Judgement and condemn us. He will stand and judge us for our hypocrisy of condemning him while perpetrating a far more egregious evil.
Come now, get a grip on reality. We are not perfect and we've had some bad actors of our own but were nothing but small fry and nothing that even comes close to Hitler, Stalin, Pol Pot, Mao etc.
I assume you are talking about abortion?