A. The majority of Wikileaks' leaks are not related to the U.S. at all. Wikileaks is hardly biased.
B. Assange is directly responsible for the creation of Wikileaks and indirectly responsible for dozens of spin-offs. Hundreds of major cases of whistelblowing probably never would have happened if it weren't for Assange. So yes, wistleblowing needs Assange.
C. Assange set himself up to be the scapegoat. He's sacrificing himself for a greater cause. Your analysis of his motives are insulting.