Hard to disagree. All the potential witnesses know that Congress can't protect them. We have an AG who was held in Contempt of Congress and he wears the citation like a badge of honor. Whatever happened in Benghazi is such that the Regime will do anything to keep it quiet. If a witness tried to come forward, would he even get there. If he did, would his family be safe, and so on. We have an Administration that is lawless and there doesn't seem to be any way to enforce laws against them when the DOJ, FBI, CIA, etc. are also corrupt.
It is terribly frustrating. They would be in mortal danger. I do not recognize my country anymore. How quickly we have moved from freedom to a totalitarian state.