BMW India — about not opening of airbag in a major accident

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Hi, my name is siva prakash, i own a bmw gt car, i was traveling from coimbatore - bangalore, when i was crossing salem city (Near omalur) i met up an accident, a bus came and hit me on the right side of the car, luckily there was no damage for us, but the car got heavy damage, the right side door was gone and the mirror in the right was completely broken and the front bonnet was heavily damaged and lights were also broken, i just want to know why has air bag not been opened during, what is the purpose of it? When the air bag can’t open for this kind of accident, then when will it open? We have thought high budget cars give great safety, but it’s wrong, i want to make a big complaint about this! I will add the photos of the damaged car! Am very sad and also angry about this