I had some Cambodian friends at graduate school in Japan. Friendly, kind people despite growing up in hell. They also gave me great insight into the blinding power of nationalism.
My two Cambodian friends, educated urbane people, referred to the time after the Vietnamese invasion of Cambodia as when they were a Vietnamese colony.
Another Cambodian, who no one liked, when he annoyed his Vietnamese class mates too much, they would say, “Remember 1979.” This taunt would throw this Cambodian into a fit of nationalist pique. He raged against the invasion.
If any country would have benefited from an invasion from hell, it would have been Cambodia under Pol Pot and the Khmer Rouge by 1979. At least, the Devil waits for you to die before he torments you.
When judging the morality of that invasion, whose express purpose was overthrowing the Khmer Rouge, the Greens would wait for clarification from the International Law Commission. A usually opinionated political party becomes empty of independent moral judgement .
A Rawlsian Law of Peoples allows for regime change of outlaw states and humanitarian interventions by liberal democracies. John Rawls argues that states that use force against their neighbours and oppress their citizenry must be excluded from the international community.