There are "little people" currently in prison for negligent handling of classified. Right now. Actually in prison.
There are also several that aren't. Administrative punishments are common, depending on the material in question, and the circumstances. In some cases, absolutely nothing was done.
For example, all of the people who accessed the early Wikileaks stuff and those people who accessed the Guardian articles that contained the Snowden material. There was an entire PR campaign directed at Executive Branch Agencies reminding people that "until officially declassified, just because it is published in public doesn't mean you can read it".
I personally contacted DHS regarding multiple "classified spills" surrounding the Wikileaks material being accessed on non-Classified systems and sent around in e-mail. Their answer? "Delete it and remind people not to do that. No, you don't have to destroy you entire MS Exchange storage array."
Under your criteria, hundreds of people would have been put in jail. They weren't and some of that Snowden stuff was SCI/Code word.
The Wikileaks stuff in 2010 was Bradley Manning's leak of, mostly, diplomatic cables -- exactly the type of stuff Clinton was dealing with -- except Clinton's was indirect reference (e-mail about) not full cables. In other words, de minimis.
According to your gross misunderstanding of our classification system, what crime did Petraeus commit? He had a clearance, and his girlfriend had a clearance. If "had a clearance" is good enough to excuse Clinton, then why was it not good enough to excuse Patraeus?
You're baiting him. You know the difference, which is Patraeus committed a conscious, direct act in knowingly and intentionally giving classified material to a person who was not authorized to have it. Clearance or not, she didn't have the necessary "need to know".
He also explicitly and directly lied to the FBI investigators by flat out denying he did it. Hillary has been very indirect and there is no indication she every did ANYTHING remotely similar to Patraeus.
There is a significant difference between "here is my notebook loaded with TS/SCI material that you shouldn't see" and, to the FBI, "never happened"; and "received or sent e-mail that may have contained a sentence or two copy-pasted from (95%) Confidential material".