Sorry, but I have removed this question.

The fundamental problem with it is that you aren't really asking a question about history. If you had asked something along the lines of "what were the arguments Henry Kissenger used to advocate and justify the bombing of Cambodia" that would be a historical question.

Instead, you are asking

Could history possibly ever exonerate (or at least paint Kissinger in a more positive picture) for the bombing of Cambodia, his negotiation defeat for the US in the Paris Peace Accords, and any other failures?

Which is problematic in that it is a loaded question. You are ready to arrive at a conclusion, and are looking for a sort of argument to bring you there.

I am not trying to accuse you of being dishonest, and you certainly may want to have a debate to challenge your current moral judgements about this polarizing historical figure. But that isn't really what AskHistorians is about. Your question would probably be better suited to /r/changemyview