Unless your name rhymes with Bedward Blowden, the penalties for leaking information seem inconsistent and not that harsh.
That's for a number of reasons. For one, there is no single law covering the release of classified information; there's different laws for things like atomic secrets and sources and methods, with treason as a sort of catchall.
For another, and probably the cause of the first, the US loves to classify information first and ask need-to-know questions later, regardless of how relevant to national defense it actually is; we have decades upon decades of worthless "secrets" gathering dust with no real rhyme, reason, or review, and most of them are illegally classified anyway since no one with the clearance to read them has any impetus to reveal them as such. It makes Senators feel good to have stuff they read marked tippity-top double-super-secret and it gives all our spies something to do (and a way to conjure phantom almost-attacks to justify their outrageous abuses of personal liberty), but most of it could only provide aid or comfort to an enemy by remedying their insomnia.
And, of course, making a big deal about a particular piece of information would also encourage people to go look at it.
So, taken together, there's not a lot of motivation to actually pull apart a given leak and show a jury what exactly was released and why it's harmful, because chances are good it shouldn't have been classified in the first place, let alone that it was properly classified under the aegis of one of our patchwork of anti-espionage acts.