How the NSA successfully manage to prevent the Washington Post and friends from discovering and reporting on this malicious backdoor? They've been sitting on these documents for a decade. Are the journalists just that *uncurious* about the deep contents of the documents they hold exclusive access to? Was this some kind of organizational failing?
WaPo, NYT, et. al. are tied to DOD and the intel community. They are the anonymous sources that provide many of their story ideas as well as quotes and sourcing. That doesn't come for free.