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You said:
What about the ensuing holocaust in neighboring Cambodia?
The root cause of that tragedy was the bombing of Cambodia by Nixon and Kissinger after the U.S. overthrew Prince Sihanouk and replaced him with Lon Nol.
You know, if some foreign power overthrew the President, then bombed the U.S. like the U.S. bombed Southeast Asia during the Vietnam War (in which more bombs were dropped then World Wars I and II combined, not to mention tons of agent orange) I guarantee you the U.S. would turn into a hell hole, with renegade bands running wild killing people for a loaf of bread or some gasoline. But by your logic, the foreign power would be absolved of guilt, and would bear no responsibility for the mayhem which followed.
People like you who justify the Viet Nam war and its consequences are murderers, just like the politicians and generals who carried it out.