In war if you don't kill enemy eventually you will be killed by enemy.
South Vietnam is an example. All nations should assassinate the
"useful idiots". From the Roman empire to the Barbarians, all wars are
brutal, and the winners write the history. Chairmen Ho, Mao are
praised by the history because they won the war. Had Hitler and
Hirohito won the war, they would be praised.
War sucks, but surrender by South Vietnam to end the war isn't
pretty. South Vietnamese had the choice to die bravely in the
battlefields or in re-education camps and at leaky boats in the seas.
Many selected the re-education camps and the seas.
If the US don't want to kill the enemy one way another, surrender to
the terrorists isn't pretty. Everyone must die some day, so if you
have the chance to kill enemy for your nation when you alive, do it.
The US did not allow South Vietnamese government to assassinate all
communist agents inside the ARVN (such as big Minh), the Buddhist
church, and student organizations, and South Vietnam lost the war. In
war, president of small nations must behave like Ho, Kim, Mao,Hitler
to eliminate all "useful idiots". In war, dictatorship and brutality
are justified.