Whitfield Diffie, having the mind and brain to look beyond the present time, predicted that everyone would have their own computers and would have the ability to send messages to anyone they wanted. With this in mind, he essentially states that all people should have the ability to hide their messages from the government via encryption. And given the democratic beliefs that our country supposedly abides by, I agree with Diffie's views to a very large extent.
Singh makes it explicitly clear that Diffie believes that people should "have the right" to make that choice for themselves. And that is the main thing that makes his argument agreeable. There are many people currently in America that could not care less about who is able to see their messages. On the other hand, there are many Americans who are very passionate about making sure no one can get their hands on whatever they deem private and making sure to define what they wish to keep as private or not. It's similar to Marcus's argument in "Little Brother" with the bathroom analogy, how there are just things in a person's life that they wish or desire to keep private and that is completely okay. Similarly, people should have the ability to choose to encrypt the messages they send. Whether they decide to encrypt their messages or not may come down to personal preference. One individual may prefer to take the extra step to hide something they believe is private and should only be known by them as well as the recipient. There may be another individual that will pick and choose what they want encrypted or not, due to security and/or personal reasons. There might be a third person that, for whatever reason, may not want or care to get anything encrypted on the way. And while it can definitely be agreed upon by many that taking the safe route is preferred, the choice should be up to the individual, case by case.