Not if you put it into moralising terms like that. There's nothing wrong with crime either - lack of law enforcement is the issue. Shared, mutable state means

Not if you put it into moralising terms like that. There's nothing wrong with crime either - lack of law enforcement is the issue. Shared, mutable state means that your correct (single-threaded) reasoning ceases to be correct. Databases are a brilliant example of safe, shared, mutable state. You run your transaction, your colleague runs his, the end result makes sense, and not a volatile in sight (not that it would have helped.)