a threat that hangs over us like a/the 'sword of Damocles'
Freedom of expression can be a 'double-edged sword'.
(..) You didn't slay the dragon? - It's on my to-do list. Now come on! - But this isn't right! You were meant to charge in, sword drawn, banner flying. That's what all the other knights did. . That's not the point. Oh! Wait. Where are you going? (..)2001 Shrek