While I have not yet read the book, I have watched the author (Posner) explain his case on several panel shows. As I said, I retain just a small sliver of doubt. But I am by no means a JFK conspiracy nut- I haven't read the other books (apparently hundreds of them) advocating for one whacked-out theory or another, either. I don't spend a lot of time worrying about it- except when I am confronted by this all-out media blitz telling me to "just forget about it, nothing to see here, move along, son". That editorial had the feel of a pat on the head by an older and wiser uncle- "We know best, now go and play".
Pretty irritating stuff.
And, in the grand scheme of things (no pun intended), what does it matter whether I believe the "official" version or I doubt it? Nobody cares (except perhaps my wife, when I yell at some smug talking head on TV...)
I think it "does matter." I want to know the truth. I've looked at this story objectively from both sides. I've indicated which side I think is closer to the truth.
I also don't care if Posner looks like a snake or that he may defend Clinton at times, as others have indicated. Tbose are emotional responses, not logical or based on fact.