NSA feels it has an obligation to undermine major tools protecting our privacy – check out http://www.nytimes.com/2013/09/06/us/nsa-foils-much-internet-encryption.html?hp. NSA has apparently tried to get to truecrypt but without much success. They have now formalized a project to formally audit (read break into it) truecrypt – http://istruecryptauditedyet.com/