Earlier quoted context omitted.
The saddest thing about Assange's story is that when one lives in the realm of the paranoid for too long, the paranoia eats them. The US and A isn't in the business of assassinating visible targets. There's plenty of people who believe they are, but there's plenty of evidence they aren't. If they were, Manning wouldn't still be breathing.
Are you asserting that Osama bin Laden wasn't a visible target?
Some Congresspeople have made ill-advised claims around Assange, but to my knowledge he is not tagged as an enemy combatant in a war on terror and there would be quite a lot of surprise if the US sent in a SEAL team to shoot him.