The weird thing about this case is that he's already been convicted on State charges, and is already serving life without parole. He isn't getting out. So why are the Feds even moving forward with this? He's no longer a danger to the public.
I suppose there's a tiny chance that he gets his convictions overturned on appeal, so the Feds might want to pile their charges on top to be super sure. But it seems excessive to ask for the Death Penalty on top of it all.
I suppose if nothing else, it shows that the Justice Department is making decisions independently of the White House, as it should.