Assange broke no US laws. There is no prospect of criminal prosecution no matter how much you think there should be. If there was, Assange would have been prosecuted by now.
He's a creep, and an asshole, he should be strung up on general principle, there just isn't a law to make him do it. IF he had conspired with Manning and encouraged him to steal military secrets and give those secrets to Assange, then Julian Assange would be indicted under a charge of conspiracy to commit espionage. It didn't happen that way, Manning stole the military secrets and gave them to Assange.
YOUR "assurance" that he broke no U.S. laws is lacking in support.
By his own words and actions, he sure as hell broke U.S. laws.
Is there some reason why he isn't being prosecuted? Is there some reason why there has been no indictment nor request for extradition? Tell us. Please. Why is Assange hiding out in Ecuador? Surely you have some sort of support for your feeling that he broke US laws? What is it? Where is it? The support for the idea that he broke US laws is just a feeling shared by people who don't know any better.
If it wasn't Julian Assange but Jean Luc Picard ace reporter for the Paris Daily News would he have broken US laws? No, of course not.
Julian Assange owes no duty to the United States. He is not a citizen, not an employee, not in the American military. He is not under any obligation to refrain from revealing any information no matter how it was obtained.
It just FEELS wrong. We know he's bad, we know he's done something very wrong and just doesn't like us very much and he should be punished. That's how it feels. In reality, he's just a citizen of another country with a big mouth which he opened while he was in another country owing the US absolutely nothing.