I find it very sad that the bulk of comments on this matter are about Manning being trans rather than the injustice of jailing a kid for 30 years for blowing the whistle on war crimes.
I don't think Manning should spend 30 years in jail, but she wasn't convicted for whistleblowing. She was acquitted for leaking the few files related to war crimes; she was convicted of leaking 750000 unrelated documents.
The law is very clear that it's your duty to stop illegal actions, not merely report them and carry on. Chelsea tried just reporting the problems but that didn't do anything and she was given direct orders to continue the illegal activities. The guilty party (us, our government) doesn't really have a leg to stand on when complaining about the measures she was forced to take.
Imagine a convicted kiddy fiddler complaining that their legal business files got examined in court with their illegal files. Nobody would case, It's the price of crime...