Why can't it also be about the 5 years?
I'm sympathetic to Assange publishing leaks. If wikileaks was just an organization that published, fine. But the government's argument is that Assange was not a "journalist" in that he was actively involved in convincing people to leak, directing hackers to steal secrets, and providing direct assistance to Manning.
Those charges sound plausible to me, though not open-and-shut. It should go to trial. 175 years is absurd, but 5-10 seems fine.