Its a tiny part of the basic truth that leaves out any criticism of Assange. It doesn't entirely revolve around the leaking of a single video of a US helicopter killing civilians.
Despite all of Assange's many flaws, it boils down to this: he reported on war crimes, those crimes go unpunished and uninvestigated, but the US wants to punish Assange, severely, despite the fact that he is not American and never even set foot there.