Where Manning went wrong was the indiscriminate nature of the leaking. Had Manning just divulged only the information regarding specific acts of wrongdoing, she would have had a much stronger case as a whistleblower. Dumping troves of classified material without regard to their contents is not the same thing.

If someone working in medical records uncovered insurance fraud, but put thousands of people's full records out on the internet (instead of a targeted disclosure), they would absolutely civil lawsuits and criminal penalties. Even if their original intent was noble, their actions would be subject to punishment.

The ends don't always justify the means.