Julian Assange exhausted his legal option in the UK when Sweden asked for him to be extradited on charges of two sexual molestations, rape, and unlawful coercion. He ran from justice. The statue of limitations has run out on all but the rape charge.
He has illegally hacked into the Pentagon, US Department of Defense, MILNET, the US Navy, NASA, and Australia's Overseas Telecommunications Commission; Citibank, Lockheed Martin, Motorola, Panasonic, Xerox, the Australian National University, La Trobe University, and Stanford University's SRI International. also the Melbourne master terminal of Nortel, a Canadian multinational telecommunications corporation.
And those are just the ones we know of.
The Australian police charged him with 31 crimes including hacking, he was convicted in 1996 on 25 of those charges.
He is under investigation by the FBI for espionage, conspiracy to commit espionage, theft or conversion of property belonging to the United States government, violation of the Computer Fraud and Abuse Act and general conspiracy, several other nations are also investigating him.
In short, he is a convicted criminal and is hiding from justice because he knows he will be convicted on many other counts if he ever gets enough balls to show up in court and address his accusers.
Unlike many other people, who we are not going to mention, he is not innocent as he has been convicted of 25 crimes in a court of law.