Puh-leeze. Doing five years of prison time is not a pleasant experience, especially for a “white collar” criminal, someone who is accustomed to at least a middle class standard of living. Plus whatever illicit income he had accumulated from his handlers would likely be confiscated in some form or another, and rightly so.
We have to deter spying with a punishment so severe that nobody in their right mind would consider it. It has to ruin your life forever if you’re caught.
Treating it like stealing a car is ridiculous.