Human: Why did the American news media and the Vietnam War focus on the "domino theory"? Assistant: 
The American news media and the Vietnam War focused on the "domino theory" because it justified the American intervention in order to prevent regional domination by China, overlooking centuries of hostility between the Vietnamese and the Chinese. Throughout the war PAVN/VC troops were continuously portrayed as "brutal, cruel, fanatic, sinister, untrustworthy, and warlike".