Wikileaks has published less than 1% of the diplomatic cables[1]. It goes thorough and removes sensitive and personal information before posting them online[2]. Except for a handful of exceptions, they only publish information that one of their newspaper partners has already published[2].

In the US we don't say people are guilty until proven so -- Manning has made no public confession, and has not been tried. He's being held solely as the result of one man's (Adrian Lamo's) testimony, to the best of our knowledge[3]. That man was forcibly checked into a mental institution 3 weeks before said informing, and has made several inconsistent statements about his relationship with Manning, and what Manning told him to the press[4].