This is a heavily loaded prompt, so in order to respond to all aspects of it, I will break down my response into three parts in accordance with the guiding questions:
a) It is really hard to grasp what exactly the Khmer Rouge’s ‘plan’ was, as there didn’t appear to be one, but I would describe their ideology as totalitarian, aiming to literally strip the Cambodian way of life down to the baseboards and rebuild as a self-reliant and ‘equal’ society. Based on the recounts of events that I have reviewed, I would conclude that the issue wasn’t with the communist ideal itself, but with the Khmer Rouge’s approach to it. While attempting to enact communism, the Khmer Rouge went on a killing spree, eliminating nearly ¼ of the Cambodian population and leaving tens of thousands of children orphaned without anywhere to turn. Moreover, there was no clear political plan for how the country would function following this revolution, contributing to the immense destruction caused by the Khmer Rouge. I also believe that it is worth mentioning that, although I do not believe that the communist ideal in itself is flawed, when applied to the human race, I believe that it will never be able to truly achieve utopia, as the elimination of personal desire seems impossible, and even if it were achieved, would it really feel like a utopia.
b) In itself, attempting to answer the question of “how much violence is suitable if it achieves a better society?” feels wrong, but if I were to establish a standard for how we identify when suffering has surpassed the ‘tolerable limit’ in achieving a better society, I would look at a) the incremental progress and b) those being targeted. In regards to incremental progress, this standard would establish that suffering would need to be used in incremental periods, with proof that society is improving for the general population in between these periods; the idea behind this is that a government/organization cannot simply eliminate half of their citizens and say “trust us, if you let us continue you will see the benefits”. Furthermore, examining those being targeted aligns with incremental violence as it allows us to see if there is really a motivation for the killing or if it is preexisting bias; for example, there is no world in which eliminating a religious/ethnic group would actively foster a more functioning society, but if it were protesters against the government, there could be a legitimate reason for the violence.
How we should react when it is clear a society is changing for the worse, not the better, is difficult, as there are so many international laws, and we have no way of knowing that the country that interferes will not continue contributing to a society’s decline. With this in mind, I would recommend that we leave the determination of when to interfere to neutral international organizations such as the Red Cross, and when they make the determination that it is necessary to interfere, countries with the means should engage while attempting to minimize fatalities and destruction, while promising not to overstay their welcome.
c) As an American, I recognize that there may be unrealized biases in this response, however it is my opinion after doing further reading that one way in which the international community could have ameliorated the harm done to Cambodian people under the Khmer Rouge would be for other countries such as Great Britain or other european power houses to stand by the people of Cambodia. The United States continuously interferes with affairs that they shouldn’t be involved in; however, they have also done a great deal of good, whereas other countries with similar assets have not had the same impact. I believe that, as a world, we can do more to address all instances of genocide or immense suffering if more countries/groups step up and help resolve the issues. Whenever we discuss interfering with a country's internal affairs, the question of sovereignty inevitably comes up. To this, I would say that when it is clear that a) society is changing for the worse, b) innocent groups/people are at risk, and/or c) there is the potential of prolonged unnecessary violence, it is not just appropriate, but a requirement that the international community step up and step in.