Martin Luther King was a great man, and a conservative one, which is why the left turned its back on him in 1965. His primary mission was to make black Americans first class American citizens protected by the Constitution. With the passage of the Civil Rights Acts in 1964 and 1965 he succeeded. His next goal was to support Lyndon Johnson's Great Society effort to bring black America to social and economic parity with white America.
But the left wasn't interested in black America. It was interested in helping the Communists win in Vietnam. Because King wouldn't oppose the war, the left turned its back on him. Stokely Carmichael the new black "civil rights" leader called King "Uncle Martin." The Black Panthers called him "Martin Luther Coon." For the next two years King had no support from the left (nor was their a single white leftist at his side in Memphis when he was assassinated the following year). The isolation and pressure from the left proved in the end too great for King. So in 1967, he capitulated to their anti-American fervor gave them what they wanted -- the worst speech that ever passed his lips. This is speech that contains the phrase the left wants Americans to remember King by -- not "I Have A Dream" but this: "[America is] the greatest purveyor of violence in the world today."
This was a lie in 1967 when he said it and it is a lie now. Saying it was the most shameful moment of King's illustrious career. In 1967 America's military was holding back the most monstrous slave empire the world has ever known. More than one billion people were locked behind iron curtains and Berlin Walls, reduced to abject poverty, herded into concentration camps and slaughtered by the tens of millions. The United States war in Vietnam was an effort to stave off the spread of that empire to South Vietnam and Cambodia. Thanks to the leftists who pressured King into making that awful speech, the Communists won and proceeded to slaughter two and a half million Indochinese peasants and make both countries among the poorest in the world. The peoples of Cambodia and Vietnam are still in chains thanks to those who every year celebrate King's biggest lie right down to today.