It does seem incredulous that so several of Clinton’s staffers  are immune from prosecution:
The top Republican on the House Committee on Oversight and Government Reform says several Hillary Clinton staffers received immunity from the FBI  in exchange for cooperating with the now-closed private email investigation.
Cheryl Mills, Clinton’s top aide and chief of staff at the U.S. State Department, gave investigators access to her laptop as part of the deal, according to Utah Rep. Jason Chaffetz. In exchange, their findings couldn’t be used against her, he said.“This is beyond explanation. The FBI was handing out immunity agreements like candy. I’ve lost confidence in this investigation and I question the genuine effort in which it was carried out,” Chaffetz said in a statement to ABC News. “Immunity deals should not be a requirement for cooperating with the FBI.”