Of course and thankfully, the amazing Ijeoma Oluo has written a piece on white people's exploitation of MLK's legacy.
The Exploitation Of Martin Luther King’s Legacy By White Supremacy
I'm not even going to pull a quote from it, as it's seems just as disrespectful to her to take anything she says here out of context as it does to quote MLK out of context. If you're white, you need to go and read the whole thing. That is all.