...and it's a certainty that as part of his training, he was fully aware that what he was doing was completely illegal. And warned about foreign actors posing as "friends" to collect intelligence information.
Which means he is either incredibly stupid, or, he knew exactly what he was doing and knew he was conveying information to potential foreign adversaries.
He should not see sunlight for a couple decades.
Yeah, between the training and briefings you receive regarding classifications along with disclosure statements you sign, it's very apparent to anyone with a clearance that you don't do this.
One thing that occurs to me anytime this kind of thing happens, this dude, Manning, Snowden, etc... there are a LOT of people that have zero clue how any of this works, but want to comment on what should or shouldn't happen to said person or why what they did was or wasn't good.
Here's a good summation...regardless of whether something was overclassified or not (as binsfeld mentioned, there is a LOT of overclassification), all uncontrolled release of classified info is bad. There is a review process for adjusting classifications, and it works, but it is time consuming. Release without going through the process causes distrust in the system, causes conspiracy theories to pop up, aside from the actual Intel being released.
99.9% of the time, something is overclassified either because of related Intel or because the person classifying it isn't sure and takes the "better to go to high and lower later" approach. It's rarely because the government is trying to hide something. And most of the stuff that is overclassified, eventually gets a lower classification or is declassified. Again, it's not a quick process, nor should it be.