Like I said, fools, idiots, or just plain lazy; pick one.
It is impractical to believe that so many people haven't heard of carbon monoxide poisoning in that area in this day and age. Either they choose to ignore the warnings, or they simply don't understand instructions most 2nd graders would get.
So how do we go about idiot-proofing the world???
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The ultimate result of shielding men from the effects of folly is to fill the world with fools.
-- Herbert Spencer, English Philosopher (1820-1903)