You think Assange put himself at as much risk as he did to promote himself?
He spent 7 years locked in an embassy (to great detriment to his health and was arguably worse then jail), is now in jail, and is facing at least life in prison, if not the death penalty. You really think he did all that just to promote himself and for some attention?
It's not like we think everything through when we set out on a journey. He probably went in with good intentions but was blinded by the lights of fame.
To avoid criminal charges for things unrelated to his political/journalistic exploits. Plenty of people run when faced with possible jail time, e.g., Roman Polanski.
As far as I know the case was closed then reopened after some embarrassing US document leaked, and without any new relevant element. As far as I know, the Sweden authorities had the possibility to interrogate Assange without extraditing him, yet for some reason did not use that possibility.
Finding reliable sources with all relevant details is a hassle, so take it with a grain of salt. Nevertheless, I believe at this point that this unrelated affair is more an attempt at character assassination than a real thing. (I do recall that he reportedly didn't used protection, which would qualify him as a major jerk. Legislations seem to disagree on whether this was a crime or not, though.)
He was in the UK, who has an extradition treaty with the US. He was facing charges in Sweden, who also have an extradition treaty with the US.
Why was he afraid of being extradited from Sweden but not the UK? If the US wanted him they could have gone after him while he was still live in the UK.
Why fear going to Sweden? I never understood this argument: am I missing some nuance in international law?
He is being extradited to the US on the charge that he helped Manning break into classified computers. These alleged actions are no longer journalism.
Greenwald and Poitras never faced charges for publishing the documents Snowden leaked / provided. The NY Times did not face charges for leaking the Pentagon Papers that Ellsberg gave them. Assange would not have been charged with leaking documents that others provided—but he is alleged to have taken a step too far.