Power is always dangerous. Power attracts the worst and corrupts the best.
Society is like a stew. If you don't stir it up every once in a while then a...
Democracy functions best when we have an active citizenry.
Let's say a Soviet exchange student back in the '70s would go back and tell the KGB about people and places and things that he'd seen and done and been involved with. This is not really espionage there's no betrayal of trust.