I hate to say it but it's all dog and pony. If Washington DC had a shred of decency, when Lerner issued her bizarre admission that conservative groups had been targeted by rogue employees, the IRS should have gone on lock down and independent law enforcement should have combed through the emails to get to the root of the problem. As long as DC continues to investigate itself and have the opportunity to 'turn over' specific things that Congress asks for, this situation will repeat itself.
Rod Serling Voice; Imagine a world where the police contact John Gotti and ask him to send them the guns used to kill victims and a list of names of the hit men he used to carry out the murders.
As long as Lois Lerner and Eric Holder are convicted of contempt of Congress and not arrested, all investigations by the House are a sick joke. When the House starts putting people in jail, maybe testifiers will stop smugly flipping the bird at the entire country as if they are untouchable.