By then, the Democrats in Congress had put up the white flag, reneged on our commitment in the Paris Peace Accords to provide money and arms to South Vietnam to defend themselves, and sat on their hands while the North Vietnamese rolled into Saigon virtually unopposed while executing nearly 2 million South Vietnamese who had worked with us along the way.  They had no interest in stopping the Khmer Rouge from slaughtering the people of Cambodia in the killing fields, but when the Khmer Rouge starting killing Vietnamese, they took the Khmer Rouge out.