In my view, because it has segments that allow white Americans to see the speech as high ideals and ignore other aspects of Dr. King’s message. The speech begins with a challenge:
In a sense we have come to our nation's capital to cash a check. When the architects of our republic wrote the magnificent words of the Constitution and the Declaration of Independence, they were signing a promissory note to which every American was to fall heir. This note was a promise that all men, yes, black men as well as white men, would be guaranteed the unalienable rights of life, liberty, and the pursuit of happiness.
It is obvious today that America has defaulted on this promissory note insofar as her citizens of color are concerned. Instead of honoring this sacred obligation, America has given the Negro people a bad check, a 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. We have also come to this hallowed spot to remind America of the fierce urgency of now. This is no time to engage in the luxury of cooling off or to take the tranquilizing drug of gradualism. Now is the time to make real the promises of democracy.
But by overfocusing on the latter part of the speech, eloquent as it is, one can minimize or even ignore Dr. King’s call for delivery on the promise of racial justice right now.
He wasn’t just dreaming of an airy future.
He was presenting a debt to be paid right now.
It’s still unpaid.