2011 Chevrolet Cruze cruise control problems

On october 19,2018 my in laws were traveling north on route 61 in pennsylvania. They can to a red light and ran into the back of a minivan and the airbags deployed. Then we dont know what happened, but the car accelerated and went the length of a football field and they hit a pole and my mother in law died instantly and my father in law died at 5:10 am.my concern is why isn't it an industry standard that once the airbags are deployed the throttle doesn't shut down.

Stability trac and traction control light appears, vehicle experiences immediate loss of power. Experienced while driving on freeway attempting to change lanes. Due to the sudden loss of power I was nearly struck by a big rig. Dealer can not identify codes only code that appeared was po171,fuel trim lean code was addressed by dealer, dealer claims original complaint was tied to the p0171 code. While driving home experienced sudden loss of power and rough shifting. No warning lights or indicators appeared.