Well, they go public in 2027, so if you hang on a little longer, you get to listen to them.
I also believe they exist because they are backed up by a myriad of eye witness accounts.
That is also why MLK's affairs have been discussed in every legitimate biography written about him.
But if you still cannot accept reality, look up Betty Moitz...
Just be prepared, MLK was a great orator and a highly effective campaigner, but he was a garbage human being.