And how well does that work do you think? Given how many are misdiagnosed or undiagnosed before death, how much money and effort do you think is spent on the cause of death for some random, (literally) poor corpse?
You were implying, that sloppiness leads to reduced cancer statistics, painting a better picture for the US. Well, if another cause of death is used instead, the picture will look worse for it. There is no escape.
Of course "some" reason will be logged.