So you're saying that none of the Taney biographers mentioned the arrest warrant because they thought it might make Taney look bad? Really? How did it make him look bad?
Lincoln is idolized in certain circles. The same forbearance regarding objectively ugly truths hold sway.
And you might have a point, however small, if we were dealing with biographies of Lincoln. But I'm talking about men who wrote very learned and well researched biographies on Roger Brooke Taney. The 11th Attorney General of the United states. The 12th Secretary of the Treasury. The 5th Chief Justice of the U.S. Supreme Court. And in none of those biographies did any of them talk about an arrest warrant on Taney. Why not?
The person being protected here is Lincoln. Nobody in the Scholarly community wants to say anything bad about Lincoln, and if any Taney biographer mentioned it, they would be castigated by everyone in their social peer group.
Of course they aren't going to mention it. It is a smoking gun that Lincoln was a tyrant.