resumeIn brief
Airbags are part of a protection system. Their presence does not eliminate the need for a properly used belt.
Useful to know
The airbag is a complementary protection and is designed to work with the seat belt. NHTSA points out that front and side cushions are typically triggered in moderate to severe collisions, and under certain conditions can also be triggered in a lighter impact. [1]
Therefore, the same reaction should not be expected in every accident. The mere external impression of a stroke does not describe all the conditions that the system evaluates.
Practically, when describing equipment, distinguish the location and purpose of the pillows. "There are airbags" is too general if you want to find out which areas and what situations are covered. For a specific model, use its documentation.
Do not take triggering or non-triggering as a stand-alone technical diagnosis by photo. Assessment after an accident is a separate job. This text does not suggest repairing or disabling a safety system and does not replace the proper seating and belt instructions.
Sources
For further detail and to check the information: