It's frustrating when people in the company point the finger of blame without the data to back it up. Development teams are often those who suffer from this the most as they are where the buck stops - e.g. after a major software release there are issues that might be caused by installation errors/poor implementation/poor support response/user error but development get immediately blamed on 'poor product'.
I like that Jobs went down the whole clearly presented 'hard data' route to try to get to the heart of the problem; this is a good lesson on how to defend from criticism from those without knowledge of the real issues.