Snowden is currently in political exile and probably closely monitored, likely for the rest of his life. US congressmen have openly called for his assassination. If he were to return to this country it's highly likely he would spend the rest of his life in a federal prison, at best.
Please explain how 'all it took was for someone to burn their career' isn't utterly misconstruing the cost being addressed?
This should have been the case as in normal whistleblower cases. Seems it was not. I also suspect that Russia will eventually try and call the favor to coerce him to do something for them
EDIT: had no idea this would be so negatively viewed. If you're going to down vote please indicate what you're against...
And as for why your post was down voted, you stated that a whistleblower should lose their career for their uncovering the truth.
This is wrong. It took a LOT more than that. It took one man forgoing his life and liberty, and a group of people endangering theirs to assist him. Snowdon is not going to get his life nor his liberty back, ever.
It took multiple institutions dedicated to publishing the truth to actually bring the news to a wide audience, and it didn't end without a degree of betrayal.