*sigh* as I answered you before, first off the U.S. does not want Assange dead (note while there are some people that might, that is not the country or even the government as a whole)... heck they have not even filed charges on him or issued an extradition warrent and it has been several years now.
And you really need to check your information sources:
Let's see, marines who urinated on the dead taliban members - being court martialed for violating the rules of warfare/geneva conventions, can get life. (Even though per one of the articles of the geneva conventions, they cannot be tried in international courts over this due to the other side violating the conventions first. Per the Uniformed Code of Military Justice they still get prosecuted by the U.S. military though.)
Kill teams that killed innocents - 11 court martials so far. (wide range of sentences)
The guy who went on the rampage killing all the innocent in the one village - being court martial. (could face life/death penalty.)
Manning is charged with "aiding the enemy in a time of war"... (plus other charges.) he gave information including informants names who had aided the U.N. forces. (several dozen of them have been found dead since.)
Assange "could" be charged with accessory charges to everything Manning is (as they have shown he was in communication with him PRIOR to Manning gathering all the documents unread for wikileaks) but it would more likely be under espionage, or misuse of classified documents laws. (handing over unread documents is NOT whistleblowing)
If you help someone in another country steal something/commit a crime... that country CAN issue a warrent for your arrest for being an accessory, even if you never set foot in the country itself. That is part of international law. And the country where the actual crime was committed/committed against issues the extradition warrent to prosecute the person in their country... you do not get to choose which country prosecutes you, that is not how law works.
And I am sorry the documents were obtained illegally. While Manning had access per his clearance to the system itself, he did not have authorization to be in the diplomatic cables section which alone was a crime. Copying the files and taking them out of the systems was another crime per the laws. Giving them to someone who does not have clearance another crime (especially a foreign national in a time of war/conflict.)... how exactly was this not unlawful/illegal? Assange was in direct contact with Manning prior to Manning downloading all the cables. (And Manning had not been in those systems prior. This has already come out during Mannings first pretrial motion.) They were not just "dropped in Assanges mail box", per what is out there now it appears Assange may have advised Manning what to grab unread.
And given the sheer volume of the stolen files, it would be hard to tell if something was altered... mind you the apache footage in "collateral murder" (which was a tragedy, but the reporters in question were walking with a group of insurgents armed with rpgs at the time of the attack in a battle area. They had been interviewing the insurgents and had no identifying clothing/insignia) was editted by Wikileaks... a large chunk from the middle was removed.
And again, the only people trying to prosecute him at this point is Sweden for sexual molestation/rape/harrassment against two women who worked/volunteered for Wikileaks in Sweden. And the head of Wikileaks Sweden has even said both to the police and in the U.K. Gaurdian that both women are very very credible... And per the police reports on this, he was in contact with both women and Assange prior to the charges being taken to the police... the women just wanted Assange to get an HIV test and he has been fleeing from it for how long now?