As I said, Manning is still alive, and she's spent an inordinate amount of time under US custody. She's under US custody right now. If the government had "assassination of visible targets" as standard black-ops policy, why is she not dead?
Conspiracy theories suffer on lack of consistency.
Theories of grand evil government conspiracies are comforting because they let us believe someone's in charge, that the evils of the world were intended and causal. Intentions can be controlled.
The reality is much more boring and much less comforting. Hence, my handle. ;)
Conspiracy theories suffer on lack of consistency.