Why did many Americans protest U.S. involvement in Vietnam?

There were a number of reasons why Americans protested the
Vietnam War.  Different segments of the anti-war movement had different reasons.  Among
the reasons were:

• The idea that Vietnam was not
  important to the US.  To many Americans, it was not really important if Vietnam became a
  communist country.  It was far away and therefore not that important to
  us.


• The idea that communism was actually a good system. 
  There was an element in the counterculture that believed that communism was superior to
  capitalism.  This element preferred the North Vietnamese system and did not believe the
  US should be opposing it.


• The idea that the war was not
  winnable.  Especially later in the war, many Americans came to believe that the US was
  simply not capable of winning the war because so many Vietnamese supported the communist
  side.


• The draft.  Many Americans hated the idea that
  young men could be forced to go fight, particularly in an unpopular
  war.