More Words, Deeper Hole

"What do you call books that are reacting to the reaction to 9/11?"

Repetition is more commonly used for emphasis than for double negation. I would stress that the reactions are separate, possibly saying "counter-reacting" instead.

That is, post-9/11 I got books that argued e.g. that what America really needs to protect itself from the deadly menace of weaponized squirrel brains is a secret service not bound to answer to anyone, especially elected officials.

"Post-9/11" with a hyphen is adjectival. "After 9/11" is clearer.

If you are not introducing a parenthetical clause, don't use "e.g."

"from the deadly menace of weaponized squirrel brains" is wordy fluff.

Basically, both ends of the sentence are necessary to read it correctly, but the bit in the middle gets in the way.

Now I'm seeing material that suggest that perhaps oversight is useful and fanatical devotion to the pope national security above all else may have draw backs.

Many people missed this sentence. Paragraphs usually contain a single idea, and the previous sentence could have been misparsed due to its opaque irony.