Because the GOP won't do it's job.
Congress has the inherent power to arrest and imprison for Contempt of Congress. They don't need to crawl to Holder or the Federal courts.
The House of Reps could have the House Sergeant at Arms arrest Lerner and the IRS thugs that have 'lost' the emails RIGHT NOW and hold them indefinitely until they testify completely and truthfully to the oversight committee. If they lie they can be imprisoned. There used to be a jail right in the Capital Building for that purpose.
Congress has the obligation, responsibility and the POWER to hold the government agents and employees accountable. But don't hold your breath waiting for that to ever happen. The GOP Establishment and the Obama Regime both play for the same team.
True, yet in the bigger picture it is congress which refuses to do its job.
In recent decades we have become used to thinking of government in terms of two parties. In actuality they have far more in common rather than differences.
It means something approaching a Uniparty, a self-serving governing clique which recognizes no limitations is in charge. Its purpose is to increase its wealth and power and nothing else.
Until power is once again divided between the states and the government they created, there is no hope for the restoration of freedom.