The people in government, politicians and civilians, are terrified that one of them may actually be prosecuted and be sent to prison. They are afraid this would establish a precedent that may come back to bite them in the end.
All of them, both parties, want to maintain the idea that people working in D.C. are untouchable and above the law. Because of essentially universal corruption which touches everyone in one way or another, once one of them goes down, they are all in trouble.
This is why they are all protecting Hillary. Their protection of Hillary is not necessarily about Hillary. By protecting her, and Holder, and Lerner, and all the rest, they are protecting themselves.