Respuesta :
Since a very beginning, US only had a tough attitude: the world had to give explanations to the Americans and Vietnam was a country with a very deep principles, one of them was the respect for the older men as a bridge between the real world and his gods, While US despite old men as an "unproductive ones".
Using US forces would go against the idea that the Vietnamese people should be free to pick their own leadership and form of government.
Conflict would cost the United States in lives, money, and moral authority.
Conflict could cause harm to the people of Vietnam.