Tyrannical regimes pick their battles. If you're outwardly compliant, useful and unexceptional, chances are you will live a long life. We need to pick our battles, too. Tyrannical regimes don't die at the touch of truth and free speech. They die when regime security forces stand aside and let a mob storm Dear Leader's palace. That requires a lot of speech. Over a long period of time. Anonymous speech is best speech.