I will not speak a lot on this, as I'm still studying these things myself.
But a deep quote should be sufficient for you, as it will make more sense as you advance and learn.
"History is written by the victors."
Nobody is forcing you to agree with anyone, and we especially don't want people who need to be told what to believe, without research or critical thinking. We are not reverse christianity, we are Truth-ists.
Just don't worry about these things unless they literally prevent advancement.
I personally bought into many lies about WW2 Germany in the past, and as I advanced in my practice I couldn't get the thought that I was supporting evil out of my mind.
I simply asked the Gods to show me what I need to see, and I got the right evidence to calm my mind, both here on the Forum and in reading.
Give it time, these things will make sense.