Why did some people classify the Viet Cong as a "terrorist group"?

According to official documents, the U.S. used several chemical warfare weapons in order to obliterate farm land for miles and leave a good fraction of the South Vietnamese population with various illnesses up until today. Not to mention they killed 2 million people. So if the Viet Cong fought against this in order... show more According to official documents, the U.S. used several chemical warfare weapons in order to obliterate farm land for miles and leave a good fraction of the South Vietnamese population with various illnesses up until today. Not to mention they killed 2 million people. So if the Viet Cong fought against this in order to protect their country from terrorism, isn't it ironic that they got labled as terrorists? If anything, they were the heroes.
Update 2: Well SuzyQ, it seems you have proven me wrong. I didn't know about that massacure. In that case, both Viet Cong AND U.S. were terrorists. Wow.
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