Augustus
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Ba Chúc massacre - Wikipedia
So their "inherent badness" goes from "want to enslave half of the wolrd" to "oppress their own people"? How many people flee to the US from Mexico every year? How many people flee to Europe from Africa every year? Are they any different than any other thirdworld country? No.
Obviously their invasion wasn't a humanitarian intervention. It was a righteous counterattack after Cambodia has declared war and attacked them. Ba Chúc massacre
If you want to believe that the Soviet Union was the 'good guy' in spite of the colossal amounts of evidence to the contrary, I doubt there is much that can change your mind as it is not an opinion held on a rational basis.