The system that Manning "hurt" through his actions is the same system that is punishing him. How is that even remotely comparable to the Nazis and hiding Jews? According to Nazi law, hiding Jews is an act which draws consequence. It wouldn't be surprising if the perpetrators were executed by that system for those high crimes. It isn't surprising, then, that this system is doing what its own code dictates. That doesn't make his court-marshal "right", per se, but seeing as he broke the laws of the system, IT DOES NOT MATTER if it's "right" or "wrong," The system's reaction must be to punish him under its own law.