"The fog of War"

Yesterday, I watched a movie titled “The fog of War”. This is a documentary movie in which former Secretary of Defense Robert S. McNamara introduces 11 lessens he learned from his experience about national security such as Cuba Missile Crisis and Vietnam War. 11 Lessons are as follows.

Empathize with your enemy.
Rationality will not save us.
There's something beyond one's self.
Maximize efficiency.
Proportionality should be a guideline in war.
Get the data.
Belief and seeing are both often wrong.
Be prepared to reexamine your reasoning.
In order to do good, you may have to engage in evil.
Never say never.
You can't change human nature.

These lessons look so universal that everybody knows all of them without watching the movie. However, knowing them and being able to acting in conformity with them are totally different. According to McNamara, even Kennedy was in the verge of a nuclear war because he misunderstood the intention of the enemy, USSR Communist Party Leader Khrushchev (In this case, he was not able to “empathize with your enemy”, which is the first lesson by McNamara.). I know I am much less mature than Kennedy, and that is why I am studying Kennedy School at Harvard. So, I would like not only to understand what is important, or what is necessary for the good of people, but also to become able to practice those ideas here.