Re: USA
Certainly no-one should be extradited anywhere for practising Journalism.
If he did, in fact, help Chelsea Manning crack passwords for classified databases, that goes well beyond protected free speech. Per the article, the US charges are for "conspiracy to commit computer intrusion" -- not for publishing the hacked material. Many US news outlets reported and/or republished the WikiLeaks material after it was released, and none of them were prosecuted.
From what I've read in El Reg and elsewhere, it sounds like the UK actually has stricter laws on that sort of thing than the US.