"The occupants wear seatbelts and airbags fly out from all around, "
In the rest of the world yes, but in America it was estimated that approximately 30% of drivers didn't wear safety belts. 18 states only treat it as a secondary offense. Of the other 31 (New Hampshire is odd, it's primary for children in the front seat) only 8 had it as a primary offense originally.
Hence the very fast airbag deployment systems on US cars.
In at least one known case a 7YO child was in the front passenger seat when it was tripped while not wearing a safety belt. Deployment broke the child's neck.
Perhaps a few more decades of "evolution in action" will see the rest move it to a primary, as most of those who demand the right to drive without a safety belt manage to auto-Darwinate themselves.