I had a similar experience recently watching "The Long Hot Summer," with Paul Newman, Joanne Woodward and Orson Welles. It's a fantastic movie and impeccably drawn, down to all the Southern period details -- the black servants, the patriarch's speech (Welles) about how he wants SONS.
Now somehow for me watching a movie with these problems is less difficult than reading a book with them. I would be interested to know if this is also true for others. I think that a movie, if done well enough and seamlessly enough, ultimately has an effect much closer to that of a photograph. Yes, you know the photographer is saying something by framing the shot in a particular way; but when you come right down to it those people in the picture actually, in some sense, exist. The photographer is just capturing them. And if s/he captures them in a way which shows something indelible about the way human nature reacts to a particular circumstance -- well, I am somehow much more inclined to be charitable to the photographer: yes, this is actually the way things were at this particular sunny afternoon in Mississippi -- we can learn from them.
Whereas I think on some level (and again, it would be interesting to say why) I hold an author accountable for the people he or she creates -- I really feel that he or she has some power over them. Somehow with a book, even a book which is objectively true to life, there is a feeling that the author actually actively created. Maybe this is because in a movie you can look at anything you want to: the edge of the frame, at the lilac bush in the distance during the close-up for the kiss. Whereas in a book you feel that there is no escaping looking in a particular direction.
Or perhaps: there's no escaping your own participation in imagining, in making these characters exist -- you can't as easily stay out of it. You can't just watch.