We need to remember that Hitler, the Nazis, and other German people were humans as you say, and not God. Humans do evil things, and God does not. This is why we need to trust God. We really don't believe there are parallels.
We also believe that you should try to straighten things out between you and God before you die, because it will help you deal with these earthly atrocities. Seek the good and not the evil for answers.
We don't recall anywhere in the Bible were we are told that God can foretell the free will choices that humans and angels make. It's like the comments He made to Cain before he killed Abel. He may know the consequences of making the wrong decisions, but the desire of His heart was that we would all obey His will, and it was upon this premise that He created the heavens and the earth.
The angels, and in particular, Satan, thought he could do all that God did. He became arrogant, like a lot of human beings who do whatever they want against the will of God.
We also believe that God is everything He claims to be and more.
In the Love of the Lord,
Frank and Mary