How on earth can an ignition switch flaw lead to 12 deaths? Electrocution? Steering wheel lockup while the vehicle is in motion? Sudden electrical fire? That just sounds bizarre.
If your ignition suddenly cuts out on a highway, turn, intersection etc. it would be very bad and potentially fatal, as 12 people dead attests to.
The ignition cuts off, the car crashes and the air bags don’t deploy because the power is off....people die. That is what has been happening.