Let's be clear: What Assange and WikiLeaks are doing is incredibly irresponsible. They're uncovering important channels that are going to close up if neither side can trust that what's said won't become public (this is especially true of critical Middle Eastern relationships). Even worse, they're outing confidential informants and information critical to national defence. I hope they're prepared to have blood on their hands.
These documents will undoubtedly reveal some important stuff that the public should know about, and I'm not saying that everything that the government does is automatically good, but I think that most experts in the field would agree that Assange is doing way more harm than good here. There are important trust-based relationships and sources, nurtured for decades, that have just been utterly ruined, if not severely damaged.
Diplomacy is incredibly complicated and nuanced, and this naive belief that indiscriminately releasing thousands of documents and cables is automatically going to make the world a better place is totally out-of-touch with reality.
My theory (and sorry if this sounds mean) is that the same personality traits that make geeks great at visualizing logic and data comes at the expense of being able to understand nuance. You see it with the tech press' bizarre, highlanderistic insistence on everything being a something killer, you see it in the anti-government streak that is rampant on HN, and I think you're seeing it here.