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Apariah...I think you have stated the obvious here. In the examples you gave, the only reason illness or death did not occur, was that there was sufficient ventilation. But logic would say that in most cases of BBQs being used dangerously, its the inclement weather that causes people to move the things inside in the first place, and that is the same reason that doors and windows are not left open.
In this, case of course, the BBQ was being used to heat a home.
There seems to be a slight scepticism creeping into this topic. Can I assure everybody that using a BBQ in unventilated areas, or even poorly ventilated areas is a very, very bad idea indeed, whatever apocryphal stories people might have heard.