"Since you have been influenced by the argument of 'outsiders coming in.'" MLK is talking about how he is alone because he is from Atlanta instead of Birmingham.
"Why direct action, why sit-ins, marches, and so forth? Isn't negotiation a better path?" MLK thinks that negotiations are what he wants the crowd of people to talk about. He wants people on the line to change their minds about him and his ways.
"Freedom is never voluntarily given by the oppressor; it must be demanded by the oppressed." MLK is basically saying, you want freedom and respect, ask and give it yourself.
Martin Luther King Jr. was born on January 15, 1929, died April 4, 1968. He was an American Baptist minister and activist who was a leader in the Civil Rights Movement. He is best known for his role in the advancement of civil rights using nonviolent civil disobedience based on his Christian beliefs.