corruption is an endless feature of human communities. one way to keep it somewhat under control is to publicize it to the broader community rather than allow it to remain secret. the corruption doesn't need to be extreme enough to warrant legal action (though it might); it could just be "bad for most people, good for a few".

stupidity has most of the same properties.

the main feature of those human communities that we've used for a few hundred years to try to accomplish that control is called "a free press".