Why have they lost your respect now and not years ago? Didn't they publish 750,000 unrelated and benign files along with the couple of files that showed government wrongdoing when they leaked Manning's stuff? Its not like Wikileaks changed recently, its more like people are just finding out what Wikileaks is.
So official government emails vs official company emails? These weren't individuals' private emails, they were emails sent on company information systems. When you send private emails on a company system, they become company emails.
There is definitely a difference between the two, but I don't think it matters much in these particular cases.