I really don't trust any device with my life rather it's the safety on a firearm, a guard on a chainsaw or an airbag. Any accident can be a potential tragedy, people die in fluke accidents from time to time, fender benders turn fatal, slipping in the shower, top athletes have had heart attacks in the gym, etc. It's not the government's responsibility to protect us from any and every possible danger and it's certainly not the responsibility of an auto manufacturer to perceive every possible danger and implement fail proof protection, cars would cost eleventy-billion dollars if they tried, and people would still die in accidents. Life isn't easy, bad things happen, every one will die. The notion that an air bag should save a life because you paid for it is somewhat ridiculous, you can't pay Karma, or God or the Grim Reaper or whatever you may believe in, even if you could you certainly wouldn't submit the payment to a car dealership.
Death is the tragedy, the deployment of an airbag is irrelevant.