A lot of people failed on this issue long before Hillary.
Do you believe 100% of her email was entirely unclassified at the time it was sent?
As for innocuous, it's reported that her emails (unsurprisingly) included intelligence from "special access programs" which are actually classified beyond top secret.
Excerpt:
How did Clinton receive and consume classified information?
The Secretary's office was located in a secure area. Classified information was viewed in hard copy by Clinton while in the office. While on travel, the State Department had rigorous protocols for her and traveling staff to receive and transmit information of all types.
A separate, closed email system was used by the State Department for the purpose of handling classified communications, which was designed to prevent such information from being transmitted anywhere other than within that system.
I'm not defending the practise, but let's not be glib.
She did, officially, but she's mentioned several times she never used it, and wanted to have her private email server for "convenience".
However if idling of the engines is required by security protocols then you can't complain nearly as much.
I do expect to put a ridiculous time value of money on the Presidents time and even higher on security. But it should be done to minimize inconvenience to others.