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If you're not enjoying reading something, you don't have to finish it.
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At the end of the day, this is one man's perspective and it could be an interesting snippet of a historical nature. It doesn't mean you have to agree with what is said or how certain people are portrayed to get value from it. It just means this person's perspective is different from yours. It's up to you if there is value in that for you. If not, refer to point 1.
Note: I have never heard of this book, have not looked up anything about it, and probably wouldn't read it as I generally prefer fiction.