There's a tendency to be very idealistic when talking about IO in haskell, people talk about launching missiles when you ask to print a string and it makes you

There's a tendency to be very idealistic when talking about IO in haskell, people talk about launching missiles when you ask to print a string and it makes you think we're purist fools. For debugging you can easily drop print statements in without affecting type signatures (with the Debug.Trace package) and this is really helpful but in production you almost never want logging inside pure functions. Think about it, why would you want to log runtime information inside a function that does arithmetic or parses a JSON string? The interesting stuff is when you receive a network request or fail to open a file.