Good point. I don't know what's actually in the book yet. But information is classified for a reason. Leaks, however small, or seemingly not grave, give one piece to a larger puzzle. It's the putting the pieces together from multiple sources with the other pieces that causes the harm.
We can't be hypocrites here. Bill Gertz has written more than one book with classified info on China and other issues. He did the same research this author did.
Don't get so caught up in support for Bush that it clouds your judgment. That's exactly what Clinton supporters did and what Clinton depended upon.