This sort of logic is a bit silly. If 1,000 people read extremist propaganda like this book, most of them will see it as garbage and not be influenced, but some will be influenced by it in a way that is bad for the Navy and America generally. How do you think people are radicalized? Should the CNO put reading material on there about the flat earth? Or about extreme right wing ideologies? Maybe we should use tax payer dollars to allow people to read these types of works for free as well? These would surely help expand people's minds and understand the points of views of others, right? What, are you afraid of these ideas?
I'm not afraid to read these ideas myself, but I would be very afraid if they became, to take the description the CNO applied to it, "foundational" to the curriculum we provide people in an unguided course where nobody is around to challenge the blatant lies and ridiculous arguments.