Many Americans opposed the war on moral grounds, appalled by the devastation and violence of the war.
Explanation:
The Americans didn't want anything to do with devastation and violence of the war. Not just American citizen's felt somewhat like this. 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.
The first amendment allows for freedom of religion. Maybe the students don’t believe in “under god” and if they do the constitution also calls for the separation of church and state.