Second generation airbags still deploy with plenty of force to break bones and cause significant injury.
I have NEVER heard of an airbag malfunction on a modern vehicle, especially a Lexus. It is far more likely than not that the airbags were operating properly in this situation.
Krissy, I know you're upset but you're not understanding what we're saying. The safety features are designed so that you don't have to think about what force needs to be present for the bags to deploy. The system makes that determination based on the forces present in any given crash. Your airbags did not deploy, therefore the forces present were not sufficient to cause them to deploy. If the airbags should deploy when they are not neccisary, they could cause you injury instead of saving you from it. It has absolutely nothing to do with the car or it being a Lexus.
No need to worry. The car did what it was designed to do, it kept you and your family safe!
AH, the plot thickens! You weren't wearing your seatbelt!
The car also takes this into consideration when deciding whether or not to deploy the bags. Without your seat belt the airbags become even more dangerous. The belts are designed to hold you in proper position to be cushioned by the bags. Without the belt...
You know the number one way to be safe in your car? Wear your seatbelt. You have absolutely no right to blame the car on your injuries, you caused them by failing to wear your seatbelt. If you don't wear a seatbelt you should be afraid to drive ANY automobile.
As for finding data that Toyota/Lexus bags fail to deploy. You'll have to show me that because as long as I've been a Lexus enthusiast and around the Internet, I've never heard of even one case.
Do the right, responsible, & intellingent thing for yourself, your family, and your society. Wear your seatbelt.