I don't see how that's differnt from Malcolm Gladwell's books. Yes when we read them the ideas feal on the border of speculation, but they are interesting, they help us stretch our minds and see things from differnt perspective. Even when we disagree with some conclusions, this help us define our own understanding on the prbolems discussed.
BTW some of Paul Graham's essays have the similar impact on me, sometimes I don't agree with his way of thinking, but still find them very insightful.
And exactly because of that it makes the book useful to read, so that you can notice and identify sociopathic techniques, and decide how to deal with them. I feel the same way about certain sales books I've read, being conscious of the techniques takes away much of the power those techniques have, and allows you to make rational decisions without being swayed.
It is only negative if you choose to do negative things with it. It gives plenty of insights on human nature. If you choose to do bad things it is not because of this book.
BTW some of Paul Graham's essays have the similar impact on me, sometimes I don't agree with his way of thinking, but still find them very insightful.