I didn't see a lot political in the book myself, nor did I feel much guilt after reading it. Most of the criticism I read on the book I did find political and from the left.
In any case Howard zinn who did wright from a far left point of view did have some interesting things to say, so does glen beck, though he is 'right'.
When I read some work on history that steps out of the box, and I see criticism of that work for that criticism to make sense to me it has to say something more then " it's just (left or right wing) garbage. Or some times the author is criticized because his degree is in another field, or it flys in the face of current dogma.
Look at the criticism Baker got for suggesting dinosaurs were warm blooded, and an equal amount over regecting the death by meteor theory, but the evedence seem to be on his
side...again.
Guns germs and steel made a lot of good points about the development of civilization, as did mans rise to civilaztion as demonstrated in America from primeval times to the coming of the industrial state, even though it was dismissed by critics for being anti Indian.
We all have political leanings, and dogma from religion or science still colors our vision, but facts are stubron things.