John f kennedy believed that a leader should

a. disease epidemics during peacetime have resulted in more deaths than history's major wars.

Explanation:

On Armistice Day of World War I, in 1918, the world was already fighting another battle. The Spanish flu had exploded, a pandemic that in the end killed almost three times more people than the 17 million soldiers and civilians who died during the so-called Great War.

The most dangerous diseases tend to be headlines when there is a risk of a pandemic, such as the current Ebola outbreak. When this is not the case, they are usually ignored despite the fact that each year they kill more people than wars and military conflicts.