From a fascinating article published in FP "The deeper threat that leakers such as Manning and Snowden pose is more subtle than a direct assault on U.S. national security: they undermine Washington’s ability to act hypocritically and get away with it. Their danger lies not in the new information that they reveal but in the documented confirmation they provide of what the United States is actually doing and why. When these deeds turn out to clash with the government’s public rhetoric, as they so often do, it becomes harder for U.S. allies to overlook Washington’s covert behavior and easier for U.S. adversaries to justify their own.
Few U.S. officials think of their ability to act hypocritically as a key strategic resource. Indeed, one of the reasons American hypocrisy is so effective is that it stems from sincerity: most U.S. politicians do not recognize just how two-faced their country is. Yet as the United States finds itself less able to deny the gaps between its actions and its words, it will face increasingly difficult choices -- and may ultimately be compelled to start practicing what it preaches."
From another artcle an US official “It will be very difficult for the US to dig out of this, although we will over time. The short term costs in credibility and trust are enormous.”
Glen Greenwald wonders " First, note how leaders such as Chancellor Angela Merkel reacted with basic indifference when it was revealed months ago that the NSA was bulk-spying on all German citizens, but suddenly found her indignation only when it turned out that she personally was also targeted. That reaction gives potent insight into the true mindset of many western leaders."