Of course Atkins had lived to an average age for a male, and died of a heart attack. My grandfather ate a very low fat diet, smoked three packs of cigarettes a day from the age of 16 onward, and lived longer.
The only real reason we have the discussions and studies is because we live and eat in an environment that it not natural to us, and researchers are noting connections between our habits and our health.
Many people like to reference these studies to simply go against the grain, or even to justify their habits. But common sense is in order. In my own life, most of my peers that ate high-saturated from early on had serious health problems by the time they hit their mid-40s; some are even dead. OTOH, the older people I know that ate healthy and exercised are still active in the 80s. When studies go against everyday common sense, I greet them with pessimism.