Front Air Bag problems of the 1999 GMC Yukon

On 12/14/07 we were involved in an auto accident. We were traveling at about 50mph and ran into the back of another vehicle. The whole front passenger side of our Yukon is totaled. The front end/battery and other items is pushed up into the engine. My concern is that neither one of the airbags deployed in the accident. Why? the impact should have released the airbag and the driver of the vehicle hit his shoulder on the steering wheel, which the airbag would have prevented that.

We contacted GMC customer service (victor johnson) and requested an investigation. GMC has now told us that since no one was fatally injured there will be no investigation. How can they do this? my wife has been injured - probably permanently- and we want to know why they did not deploy - as this was a direct frontal impact. I believe that the manufacturer has an obligation to us and is merely playing a game at this point. Is it in our best interest to hire an attorney on the matter or what should we do?.