Your thread asked if narcissists are the biggest cause of death and suffering on earth.
We certainly now understand more about narcissism.
Buried in the subsequent posts are the facts:-
In both our countries, and increasingly the rest of the world, heart / circulatory disease and cancer are by far the main causes.
The modifiable risk factors for heart disease are smoking, blood lipid levels (statins can work wonders), diabetes, obesity, and exercise level.
Environmental factors account for MOST cancers - smoking and diet being the most important.
Infections such as malaria and tuberculosis cause 3 million deaths / year worldwide, yet treatment is available at a cost.
Personality traits such as narcissism and aggression may play a role at an individual level in susceptibility to disease. They certainly affect the politics and economics of public health in the UK, Philippines, and the rest of the world.