Most whistleblowers have a high moral and ethical standard. In current societies where people make it to the top lying, cheating and misusing or even suppressing others, we watch movies about Jedi and turn a blind eye to the dark side the minute the TV is turned off. Humans are an odd species.
I think I read this about the original Simpsons: they were very critical of certain things, such as environmental dangers. But most people tuning in fantasize their role in protecting the environment, then go in with their lives without doing much about it.
I think this is deep in all sorts of media with a positive message - scratch the moral itch so you don't have to do it in reality.
