Answer:
LBJ went into the war on a more conversative note. They started as a fight for peace and compromise,
which kept anti-war people happy and war pigs upset.
One of the problems was that the Vietnamese people didn't want the American troops in their country.
Some people in "South" Vietnam were on the side of the Viet Minh because they wanted the imperial capitalists, known as the United States, out of their country.
The war divided the U.S. People were either "doves" of "hawks"
And now the Hippie side.
Doves were against the war. These included the anti-establishment "hippies."
Reasons for Opposition
People thought that the draft was unfairly administered, targeting the blue-collar Americans.
For the first time, the war could be watched on television uncensored, and this contributed to the student activism. They could see the war as it happened and it infuriated them.
Students also make moral arguments against the war. They accused the U.S. of having imperialistic goals in Vietnam. Photos of the civilian casualties arose caused a public outcry.
On top of not being wanted by the people we were fighting for, many people on the home front felt that this was a war that the US didn't need to interfere in.
They felt that the civil war was being fought by North and South Vietnam and we had NO business getting in the middle of it.
Other Americans who opposed the war felt that Vietnam was insignificant and the United States Military was wasting man power when we should have been fighting China or the Soviet Union.
Many demonstrations of anti-war protests took place in college and high-school campuses.
After that protest, Nixon planned to "Vietnamize" the war. By that, he meant that he would begin to pull US troops out of Vietnam and leave the fighting to South Vietnam.
on the other side...
The Hawks supported the war.
They believed in the Domino Theory and were convinced that the U.S. should be in Vietnam to stop communism.
The war divided the U.S. in half. Even in the same family, some were hawks and some were doves.
This is why it remains a controversial issue even today.