Why did Americans disagree with the Vietnam war

Many Americans opposed the war on moral grounds, appalled by the devastation and violence of the war. Others claimed the conflict was a war against Vietnamese independence, or an intervention in a foreign civil war; others opposed it because they felt it lacked clear objectives and appeared to be unwinnable.

Most American's dislike war on what is called moral grounds, Some others may claim that the conflict of the Vietnam war was against freedom, independence, and a foreign civil war.