You don't have to be a Satanist to know what they believe, just as you don't have to be a Tolkien fan to read The Lord of the Rings.
And where is Darwin's theory now? Even in school, they say that it is mostly wrong, and Darwin himself admitted its inconsistency before his death.
Hitler took any more or less convincing and logical arguments from others into his ideology.
Regarding the question of Good and Evil, there is indeed subjectivity. When talking about hunting, it is true that people get Good (food) from hunting, and animals get Evil (death). Burning progressive scientists during the Inquisition was good for most Catholics; they were firmly convinced that they were doing good, but that doesn't mean it was actually good. Every person judges through the prism of their own consciousness, so the good of a Christian and a Muslim is different; they have different consciousness.
In war, everyone has their own truth. Wars arise from the desire for advantages and the desire to protect oneself. In modern consciousness, it is not considered beautiful even among the inhabitants of one's own country to say: "We are going to war for loot," so things like preemptive strikes, the division of the world in the Cold War, and pseudo-searches for nuclear weapons appear.
The people *scratching their heads*: Well, that's true, what the hell?
That's how it all begins:)