Why does king discuss white moderates in his letter , who were generally sympathetic to the cause of civil rights ?

Read the excerpt from "doc rabbit, bruh fox, and tar baby" from the people could fly that was the way bruh fox found him. doc rabbit was stuck in tar baby. bruh fox got him loose, "what must i do with you? " bruh fox said. he led rabbit along to the house they were buildin. "you the one drank up my crock of cream. i didn't get one taste. . " which best describes the message of this fable

Ihave no idea what the explanation is.

What is the message? how does langston hughes convey the message in this poem?