"Dozens of others have been injured, some left with brain damage."
So deaths are not the whole story.
While one is certainly far more likely to die in a automobile collision, of heart disease, or cancer, I don't think it helps anyone to ignore the risks of carbon monoxide poisoning.
Incidentally, other sources of carbon monoxide can also exist in the home, so it's a good idea to have a carbon monoxide detector there. Perhaps cars too can be outfitted with them.