This statement you made is not logical:
When a person dies from a heart attack his blood stops flowing, so there is no way to see what really caused it.
There is credibility with some thousands of valuable medical studies re forensics and autopsies. Let us give credit for the advances in current medical research.
These days the medical research I've seen is showing less and less conclusively that evidence points to high cholesterol alone as a causative factor for heart attacks. For example examining scar tissue...plaque buildup, condition of all the other vital organs..and circulatory system as well as the condition of the brain has to count for something of an overall view of cause of death.
If in the last 75 years we've gone from a typical person doing hard physical work, to a lifestyle where driving everywhere instead of walking is rampant...the tolerance for physical labor and activity may be a factor in overall lack of vibrant health. IMHO, reliance on medical procedure and medicine is not the answer to overall vibrant health past the age of 60
From what I've read, the overall medical research view is fairly complex...lifestyle, diet, low in animal fats..and good genetics may play a big part in improved health and vibrancy. Diets high in anti-oxidants and reducing anti-inflammatory (cig smoking, pollution, fried foods diet)elements seems to be indicated.
In fact my primary care doctor is not so strong about anti-cholesterol meds he originally had prescribed . Though my numbers are good, my family history is bad. So I exercise regularly and lower my animal fats to near zero..with no red meat. YMMV (your mileage may vary).