So you are sure that lying is the only thing Clapper has ever done wrong.
To me it is obvious that he is an inhabitant of the very bottom of the swamp.
You can bet he and Brennen are being investigated. There is no way to get to the bottom of the spying and wire taps without investigating them.
Charging Clapper with perjury would not have indemnified him against any other charge. There is zero evidence that that he’s being investigated for anything else. It’s simply a matter of blind faith on the part of the TRUST SESSIONS faction.