From their experience or from the recorded experience of others (history), men learn only what their passions and their metaphysical prejudices allow them to learn.
The true credit for our safety and security goes to our men and women who are serving in places like Iraq and Afghanistan in the global war on terrorism.
Nothing is more useless in developing a nation's economy than a gun, and nothing blocks the road to social development more than the financial burden of war. War is the arch enemy of national progress and the modern scourge of civilized men.
Men like Hitler and Stalin and their immediate lieutenants cannot plead in defence of their actions that these were justified by the accepted values of that time.