I'm wondering if the father had a second vehicle stashed somewhere close to where the VW 'crashed'. Perhaps the whole scenario was staged to appear that all three were in the VW when it crashed, using the melting ice cream cones as evidence the girls were in the car.
I checked online regarding the fact that the airbags did not deploy. There have been lots of issues and complaints with the VW Passat regarding airbags not deploying in front end, rear-ended collisions. It appears that the company redesigned the vehicle's airbags in 2017.
Volkswagen Passat Air Bag Not Deploy Problems - part 1
Locals have stated they heard screaming late at night. I initially assumed it was because the girls were involved in a car crash. But what if they were agitated and upset because their dad drove them somewhere nearby and left them in another vehicle while he went through the motions of crashing his own car? Even as I write this it seems so improbable, especially when you consider the amount of damage the car sustained: all windows blown out, the tires blown, flipped over - and no deployment of airbags. All those add up to grievous physical injuries. It seems impossible that all three occupants could have exited an upside down vehicle in the time the driver Lyne Provenchar, who witnessed the crash, got to the scene.
Amber Alert lifted: Two young girls' bodies found after search
It's beginning to sound like Carpentier was trying to commit suicide after harming his own children.
What worries me is that the St. Lawrence river is only about a couple of miles away.
. The article above confirms they were found but isn’t clear if they are actually deceased. 
