Zimmerman shot an unarmed teenager on the street and it is considered a minor action not deserving any punishment. Manning revealed information that would have been in the public domain in any functioning democracy. He faces a possible sentence exceeding a century, although that sentence might be reduced by 112 days to compensate him for the torture he received in pretrial confinement.
What Manning Revealed:
• Military action that resulted in the deaths of children, journalists, and other non-combatants. Such action being illegal both by UCMJ and international law.
• Military operations within foreign borders of nations with which we are not at war. By law and the Constitution such actions require Congressional approval and public debate.
• A variety of inter-embassy gossip that mostly revealed US ambassadors are catty children.
In the eyes of a police state punishing Manning is considered justice. In the eyes of freedom loving individuals (an abhorrent thought to a police state) his actions are the least we would expect of a government employee.