He knew what was happening in Cambodia, too. He said something along the lines of "Pol Pot is bad, but a necessary evil to stop Vietnam's communism from spreading."

I don't know what's worse than children being euthanized because they need glasses or teachers/professors getting public executions for being teachers/professors. And AFAIK, it's the largest killing in history based on population. Something like 25% of Cambodians were killed by the Khmer Rouge.