The American public might be inching closer to finding out the truth behind last year’s massacre at a Christian school in Tennessee thanks to a federal judge’s order. And the FBI might have some awkward explaining to do. The manifesto of Audrey Hale, who identified as a transgender man, has been kept from the public since last year when the woman carried out her massacre at The Covenant School in Nashville. Parts of the manifesto were leaked last fall but few explanations have been offered as to why the FBI has suppressed the document. The agency had argued releasing the document might affect …