I watched the programme too and it was so shocking to see her go from a vibrant, healthy looking beauty to a walking skeleton within just those few years. It was also heartbreaking to learn she was forced out from behind the drums, where she was obviously much happier.
I don't think anyone can be blamed for her illness as people were so ignorant towards eating disorders back then and just didn't have even half of the mass of information we now have access to.
I've only recently become a Carpenters fan and I'm in love with their music and Karen's voice. The melodies and vocals were so perfect and I wish music like this was still made, because I'm bored of everyone showing off with vocal gymnastics.