Freedom is greatest authority to the individual. In order to maintain that freedom, military power must be separated from authority. Those with greatest military power should have the least real authority. If authority is in the hands of each individual then power must be in the hands of one entity separated from the individuals and from the governments that are the extension of the authority of the people, that is the only way to keep military power away from authority, which is the only way to prevent the oppression of the masses.
The word Samurai (correct me if I am wrong) means "those who serve." The original Samurai served lords, nobility. In our new democratic world the people are the lords, the masses are master. In this sense those who serve the role of world police must see themselves as the Samurai of the people. Only through such devout service to the authority of the masses could a military entity exist to loyally preserve the authority of the individuals.
Some use of authority is required simply in maintaining military power and simply in executing the policing of the world. Choices must be made when protecting the authority of the individual as individuals will often have opposing desires. Protecting the authority of each as much as possible requires some judgment and through exercising judgment authority is exerted. In that sense the holders of power, the executers of power, are guilty of the very thing they exist to prevent, the separation of power from authority. They should recognize this and should see themselves as guilty lest they forget and become too obsessed with their own power and too lax in the restraining of their personal authority.
It is the beliefs of each soldier that ultimately determines how they serve. Even in obedience, it is only because they believe in obedience that they are willing to follow their leaders blindly, even as their leaders order them to commit atrocity. If their beliefs falter then so does their obedience. So why not skip the middle man of obedience and train warriors who follow their hearts. Teach them wisdom, aesthetics, ascetics, and pacifism alongside military might. Teach them to follow their beliefs and what they know is right and to follow the leader they believe in instead of the one they are assigned to. Teach them how to cooperate rather than follow. And teach them that power is the ultimate temptation. They are the guilty. The holders of power, the ones who keep that sin and burden so that it is kept from evil men.
Every samurai MUST be a philosopher. When soldiers simply obey their leaders they can be led to do horrible things, they can be led to serve the authority of their leader instead of the authority of the people. Every soldier must respect and pursue wisdom as one of the highest objectives in life. Each soldier must hone his mind with as much determination as he hones his skills for the battlefield.