Surveillance forces journalists to think and act like spies
Once upon a time, a journalist never gave up a confidential source. When someone comes forward, anonymously, to inform the public, it's better to risk time incarcerated than give them up. This ethical responsibility was also a practical and professional necessity. If you promise anonymity, you're obliged to deliver. If you can't keep your word, who will trust you in the future? Sources go elsewhere and stories pass you by.