Hearings are for the purpose of making a report to Congress, establishing relevant facts, or lack thereof. Congressional hearings are not criminal or even civil prosecutions.
So, what happens to that report that was sent to Congress? What power do they have to do anything?
Say if Hillary admitted that she was running guns through the embassy and that Stevens was killed to cover it up, what can congress do? Do they forward the evidence to the DOJ for them to decide to prosecute? What if they are part of the cover up? I have always been unclear on the next step. We see lots of hearing but nothing ever seems to come of it.