Nazis in Germany were allowed to take over without there being a lot of dissent. We say that we want free speech and a way to dissent from authority. If that is true, then we need to offer those who report missteps a better system of protection so that we can at least be ready to hear what it is they have to say.
Sometimes people need to speak out about certain issues. When this can be considered a service to the public, whistleblowers should be provided with more protection due to the fact that they have, most likely, caused to harm to an individual or industry. They can be considered as "marked" and are in a more vulnerable state.