A conspiracy to commit a crime is a conspiracy to commit a crime whether or not it was successful. An attempt to help a break-in implicates him in the conspiracy. Assange, by his own words, indicated that he was trying to crack the password hash that Manning gave him. Assange appears to be admitting through his own words that he was assisting in the attempt to commit a crime. What he said is written - verbatim - in the indictment. The indictment was approved by a grand jury. We'll see whether he is guilty if he pleads out or if he is convicted at trial.
The law is pretty clear here. You, on the other hand, are making up the law as you go along. And you're also saying Assange is a liar.