I'm still have mixed feelings on the airbags...
But I learned to drive when all that was available were lap belts and they were optional. Shoulder belts were a big improvement. Airbags... I think tend to give a false sense of security so some people don't bother with the belts and in many ways, that sense of security leads to inattentiveness.
I've had a couple of bad accidents pre-airbag and because of the belts, I walked away from them. No nasty fumes in the lungs, no rapid deployment, and in one case, the car took two hits with the second being well after any airbags would have been deployed.
I've had friends that the airbags did their thing and saved them (along with the belts) and others that had many complications from the bags even though they were using belts. I do have to wonder if the added complexity and mis-application of the deployment makes them worth it. Sometimes, the simple solution is the best.
Bottom line... I'm still not sure about these things. They're obviously good for certain accidents and not so good for others. Properly adjust belts are always good, IMO.