Hitler was… an interesting man. And not in a good way. In a really bad way, actually.
He didn’t have the easiest childhood, but neither did he have the hardest. He didn’t have any big horrible experience that made him into who he was, just a couple of bad influences; and, by the way, he’s the one who took it as far as he did. That cannot be blamed on anyone else.
Mein Kampf, like many other texts, was authored while the writer, in this case, Adolf Hitler, was in prison for the ideologies and/or crimes they discussed in their writings. I’m pretty sure this is because they have a lot of time on their hands to stew on their thoughts and why they think they are being quote-unquote “wrongly” imprisoned.
Mein Kampf is also rife with a helluva ton of foreshadowing.
He talks about how out of the “woes of the Punic Wars,” Rome grew to greatness, and how the German state should do the same. He also mentions how if the German and Russian militaries joined forces against western Europe, it would result in global relations crumbling.
However, I think that the quote that foreshadows the coming war the most is thus, “Hence no sacrifice to insure political independence and freedom can be too great.”