Front Air Bag Sensor Control problems of the 2010 Nissan Maxima

I was involved -- in front end car accident with my 2010 Nissan Maxima. The accident resulted in a severe damage to the front end of my car all the way to the cars engine. I was surprised that the drivers air bag did not activate under the impact. I towed my car to the Nissan dealer and I spoke with their shop mechanics, he was also surprise that the airbag did not activate and he suggested the airbag frontal sensors might be defected. He referred me to Nissan manufacture department. After contacting them, a representative emailed me an air bag manual. Im really worried about the safety of my family and myself driving a defected car. I would appreciate it if you advise me to what to do. Thank you.