Read Nietsche, one of Hitler’s great heroes. In Nietsche, all traditional morality was thrown out in favor of Power, and Power was considered Good. They may have tried to hide what they did because it would be opposed, but that doesn’t mean they believed it evil, not hardly. The advancement of the Aryan race was a great and noble cause for the Nazi’s.
People who believe in Eugencs do so because they believe it will be “good” for the human race by eliminating the weak and infirm before they reproduce so as to purify and advance the race, and they were very open about it, and very assured of the rightness of it.
Its a hard thing to believe you know what Nietzsche was trying to say when you cannot spell his name correctly.