Windshield problems of the 2008 Chevrolet Avalanche

The windshield defrost system is inoperative/ineffective on the right side. I have acquaintances that have the same problem. This is a problem that has been admitted to by gm. Their statements, that the system is normal because the other vehicles we checked were the same way, says it all. We have been placing a book over the left hand side of the defrost exit to help clear the windshield. The Avalanche is a vehicle fraught with blind spots, so being able to clear the right half of the winshield is most important. The instruction I have received through gm, is that, if I have an accident due to this problem, they have a department to handle it. I feel I have been more that patient regarding this matter. I have not asked for anthing more than what I should expect from a $50k, or a $5k vehicle, safety! [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).