So long as it supported what you wish to believe.
In reading that book I have a different view of Jefferson and Madison, while they were brilliant, they were also limited in their thinking about how they wanted this country to be. Primarily they wanted a agrarian economy, which was unrealistic.
I also found Jefferson to be petty, small minded and a terrible hypocrite as to his conflicts on slavery itself. Not to mention a terrible business man.
The fact is there is a lot of blame that can go around as to slavery, and the issues of State's Rights.