I guess they figure $20 per Viper is too expensive versus fighting the first lawsuit when someone gets burned along with the car.
There is a history of not spending a few cents per vehicle to fix known dangers. You remember that one certain popular minivan, where the back door would fly open in an accident, spilling kiddies into the street? The fix would have cost an extra 50 cents per vehicle.
But you see its a numbers game, where on the one hand, you total the co$t of an upgrade, and on the other hand, you estimate the co$ts of judgements against the company, and if the scale tips towards ignoring the problem to save some money, they will choose to save money, regardless of the cost to human life. There are many examples of this.
I'm surprised Daimler even wanted to look at buying Chrysler, knowing the history. But I guess they are turning a profit now, so good for them. Hopefully their quality will continue to improve, and I'm sure it will, with the German influence at the helm.