From the prosecution's point of view: absolutely unnecessary for a conviction. They had plenty of evidence to prove he did it.
From the defense's point of view: this would not help their case one bit.
From the defense's point of view: this would not help their case one bit.
Good point.
Also, come to think of it, if the prosecution had brought it up, the defense could potentially use it to sow doubt into the jury's mind. As in this case is based on the government's paranoid fantasy of Aaaaarab terrorists using a man they claim is a white Soooopremisist, to attack an FBI office in middle America!!!