Because it isn't true. Roger Taney has been the subject of a number of biographies by different historians written decades apart. In none of them did the authors - men like James F. Simon, Bernard Steiner, Alvin Schumacher and Dirk Gringus - find any evidence that Lincoln had issued an arrest warrant against Taney. None of them mention any such warrant. None of them detail any threat to Taney from Lincoln. Wouldn't you agree that is strong evidence that no such threat existed?
>>Wouldn’t you agree that is strong evidence that no such threat existed? <<
The fact that many historians have omitted mention of this document of course is not proof that such document cannot exist. But I only say that this suggests that such a document exists. I have no proof. And that is but one piece of the puzzle for me that leads me to say that Lincoln is an enigma to me.
Now if this document is in the private collection of a certain university library, it cannot remain a secret forever, unless someone on staff is willing to destroy it.
And of course you neglect to mention the two pieces of evidence I have previously provided you regarding this claim.
That historians have left something out of the story is not at all new regarding the Civil War. I have found it to be incredibly common, especially if the books are published in the North East, as most such books are.
Perhaps they left it out because it reflected badly on Lincoln? CNN was doing that for the last 9 years regarding anything negative about that other Liberal Lawyer from Illinois who became President.