By reading the quote, we can figure out that the thought that:
The United States must address inequality at home rather fighting abroad.
Dr. Martin Luther King Jr. stated that the soldiers dying in Vietnam as always were the poor and needy, in the United States, those were usually the african american. He was fighting for the civil rights of the black people that were constantly and deliberately discriminated. He could not believe that the American government, the main responsible, was selling the idea of freedom and peace in another country, first, he thought the United States needed to solve its own problems. Dr. King also denounced that the money sent to the war was taken from the poor and black. This speech was titled Beyond Vietnam and was pronounced at Riverside Church in 1917.
The statement chosen clearly simplifies the things stated by Luther King Jr.