While airbags functioning properly with a properly sized adult reduce trauma, that's a lot of conditionals.
Seat belts conquered ejection and death, but people still didn't wear them, so active restraint and airbags became policy to have at least their 13% chance of being effective.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4366828/#sec1-1...
In most of the world it's considered suicidal not to wear a seatbelt while in a moving vehicle.
Airbags alone only had a 13% reduction on fatalities.
https://www.automobilemag.com/news/do-airbags-save-more-live...