KKK for Trump

I don't see what the problem is with the KKK's endorsement of Trump.  Trump did not endorse the KKK.  It seems to me that saying that the KKK cannot endorse Trump is an abridgement of free speech.  It's just political correctness and race hatred run amok.  It's politically correct to hate white people, as the Chris Rock and the TV commentators illustrated at the Oscars.