MLK is saying that he doesn't only care about the black people, he cares about every race. Where he says, "black men and white men, Jews and gentiles, protestants and catholics, will be able to hands and sing." This shows that MLK cares about every race and not only black people
When we let freedom ring, when we let it ring from every village and every hamlet, from every state and every city, we will be able to speed up that day when all of God's children, black men and white men, Jews and Gentiles, Protestants and Catholics, will be able to join hands and sing in the words of the old Negro spiritual, "Free at last! free at last! Thank God Almighty, we are free at last!"
MLK is saying this to guilt the white people and saying that black people are still not free. he is trying to make white people realize what they have done to black people.
But one hundred years later, we must face the tragic fact that the Negro is still not free. One hundred years later, the life of the Negro is still sadly crippled by the manacles of segregation and the chains of discrimination.
America has given the Negro people a bad check which has come back marked "insufficient funds." But we refuse to believe that the bank of justice is bankrupt. We refuse to believe that there are insufficient funds in the great vaults of opportunity of this nation. So we have come to cash this check -- a check that will give us upon demand the riches of freedom and the security of justice.
here, Martin Luther King Jr. Uses Logos to make his audience know and realize they do not have equal rights.