Three Days of the Condor is still an interesting film to watch not because it's political. It happens to be political. But that's not why the sales of the DVDs are as high as they are. It's because it's an entertaining thriller. In my opinion, Tootsie is a very political movie but truck drivers can go and laugh at it.
If you are approaching the music with more reverence than the original guys invested into it, you are effectively doing it a disservice.