The question I’d pose to the author is, what would he think of a book using examples he disagrees with? Let’s say for advocating for arming every American or against gay marriage. The vast majority arguing like the author are not ok with this - it’s only good if the content fits their world view.
Sure, you can put the examples you want in your book. I think it's your own form of personal expression, and maybe you can move hearts and souls in this way.
But you have to own it. Some people might not buy your stuff. Others will go out of their way to buy your stuff. Own the consequences to your speech.
If a white nationalist released a book in the same way... I wouldn't buy it. They might whine about me not wanting to listen to their opinion. And I don't! I would probably buy the article's author's book. But there's no fallacy there.
People want to buy and read what they want to buy and read.