Are you saying there's inherently something "immoral" about covering your tracks, using other passwords, or hacking firewalls? On what basis?
If the guy is already copying documents he's not allowed to have access to, what difference does it make using passwords he's not allowed to have access to?
"Snowden persuaded other NSA workers to give up passwords - sources"
So if the intelligence community is lying about how he got access, it is an extremely stupid lie that makes them look like idiots. If they're telling the truth, then it clearly makes the case that their operation is a humongous liability and should be shut down. Either way that explanation/story is bad for the NSA.
His actions probably put those people under investigation.