Plus, not only do the Conservatives have to win the next election (and there are other parties that would love your vote), but Cameron faces a great deal of opposition to his desire to decrypt IM - and not just from WhatsApp's 500,000,000 users.
Peter Sommer, professor of cybersecurity and digital evidence at de Montford and the Open Universities, told The Guardian: "You can pass laws in Westminster until you're blue in the face, but you can't enforce them."
And while the government wants the power to read our private messages, WhatsApp and other instant-messaging services have our privacy at their hearts.
Commenting previously on its stance on privacy in its blog, WhatsApp said: "Respect for your privacy is coded into our DNA, and we built WhatsApp around the goal of knowing as little about you as possible: You don't have to give us your name and we don't ask for your email address. We don't know your birthday. We don't know your home address. We don't know where you work. We don't know your likes, what you search for on the internet or collect your GPS location. None of that data has ever been collected and stored by WhatsApp, and we really have no plans to change that."
Sign up for MIS Asia eNewsletters.