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.
Answer: Many hated it on moral grounds because of the violence and atrocities that were committed, others didn't want to intervene in a civil war of another country, and some felt like it didn't have any clear objectives and it was unwinnable.
