It's hard to judge from the video, but the car doesn't appear to have been going very fast, and it looks like the side of the truck crumpled a bit to absorb the

It's hard to judge from the video, but the car doesn't appear to have been going very fast, and it looks like the side of the truck crumpled a bit to absorb the impact. Airbag inflation is a violent, potentially injurious, last-ditch effort to prevent fatalities. If the airbags didn't inflate but the driver walked away from the accident, then not activating was probably the safer option.