The correct answer to this open question is the following.
Unfortunately, you did not attach "interpretation 2." We do not know what "interpretation 2" is. Without that important information, it is very difficult to answer your question.
However, trying to help you we can comment on the following general terms.
As time passed by, people in the United States raising some concerns about the role of the United States Army in the Vietnam War. According to the news reports, and especially after the Tate Offensive, people -specifically young American people- started to heavily question the participation of the United States in that war. Protesters took the streets in various US cities such as Washington D.C. and organized demonstrations to protest against the war.
Many US soldiers had died in the war and that caused indignation.
