Equating the history and struggles of a people who were treated differently solely because of their skin pigmentation to the history of the natural function of culture to order itself with taboos against certain immoral behaviors is like saying zero is equal to infinity simply because they are both numbers.
I'm not denying any of that. I'm simply saying that the civil rights movement was always about more than equality. Just check the words to "I Have a Dream," if MLK's heirs haven't yet made that impossible, without paying.
Books I've read on race in America -- including Abigail and Stephan Thernstrom's America in Black and White -- have noted that the movement always called for quotas. And the 1964 Civil Rights Act and 1965 Voting Rights Act have proved racist nightmares. The Voting Rights Act, now that you mention it, has been used to end democratic elections in many areas, and replace them with fixed referenda guaranteed to elect a black. And even the CRA, which on the face of it, makes all racial discrimination illegal (i.e., merely repeats the 14th Amendment), has been used to enforce anti-white discrimination. And that was apparently its intent!
I realize that one hears today much about "the content of one's character," but that's just the neocon MLK Worship Society; not even King believed that. He wasn't a national leader; he was a black leader.