I'm not sure how some of you are attributing this when there is a clear paragraph denoting what they were doing was a duty to anyone who actually believes in what the US is asking you to do when you join its ranks: protect the Constitution, which includes informing the People of what is being done with their taxes as well in their name that ultimately makes the world less safe.
But he did not release the Collateral Murder video, it just ran simultaneously in the news cycle as Wikileaks cable releases were being run and got more attention than how a Secretary of State's role was to make way for US corporations to get stronger footholes into emerging S. American Countries in return for certain 'diplomatic' favors , and how the Intelligence agencies spied on them in the process.
Seriously, read Jermey's work, as well John Perkins' book Confessions of an Economic Hitman, this was regarded as the norm even before the cables were ever released by many sources.
So, to be clear: Manning and Snowden alike released classified information regarding Cables or internal documents of how Intelligence agencies operate in and outside the US and respectively have been crucified for it.