Well there is common a adage that says, the truth shall set you free and I find whistle-blowers not only to be patriotic and heroic, but also individuals of sterling character... in that, there is so much to lose when they expose what may be going on to everyone.
They may lose their life exposing the truth, and it could be about the Mafia or the shenanigans of government officials. I am therefore pleased to know that some of these are honored for posterity for their landmark contribution to freedom of speech and transparency in governance.