While it is true that the Vietnamese and Cambodians didn't want to be colonies, the KR were vastly worse than being colonised.
KR were following the classic communist script that we have seen played out in many developing countries. The KR were created by communists, lead from Moscow and Beijing.
Hindsight is 20/20. While it's true that the Confederacy didn't want to give up slavery, the civil war and reconstruction were vastly worse for slaveowners then giving it up peacefully would have been.
The classic communist script hasn't always resulted in genocide. Much like how the classic imperialist script hasn't always resulted in genocide.
Besides, Moscow hardly had a monopoly on sponsoring and/or training political death squads.
No hindsight. Communist takeover plans were very well-know and public for a long time.
Moscow hardly had a monopoly
Nobody claims this.
The fact of the matter remains: the KR and Pol Pot were created
following the standard communist script for "liberation movements"
in the
developing world (i.e. thinly veilded preparations for communist takeover). All the ideological training was provided by the
Soviets and their allies, as were all the many weapons and other logistics. The US was
in East Asia primarily to counter the communist threat, not to prop up
French colonies.
All responsibility for the KR and their actions is with the communists
leadership in Moscow (and Beijing and Paris and Belgrade and Hanoi).
There's direct causes, and there's indirect causes. Kissinger directly created the circumstances that let 1, 2, and 3 create the KR.