We rarely agree on anything, but I'm really disappointed you've become an apologist for her actions.
Talk to anyone who has dealt with classified/secret, etc material. This isn't a minor issue. Look what happened to General Petraeus and he gave someone with security his personal calendar, which was long outdated when he did this. It's horrible for security reasons, but also Hillary's emails should be a part of the historical record. Would it have been wrong for Nixon to destroy the tapes? Hell yes. We have obstruction of justice, conspiracy, and a host of other criminal laws which likely were violated. If a colonel did what she did he'd be facing a court martial for treason.
We haven't even gotten to the content of the emails, which could show criminal, or embarrassing information to Clinton's actions concerning Benghazi.