People regularly kill people with their cars and get less time. I don't really see how this is worse.
Espionage has increasing penalties all the way up to extreme positions such as treason.
When it pertains to government documents including public documents, CRM 1663, 1664, 1665 all can apply to this man's case. Each one can be a different change, and each one has a penalty of 5 years maximum.
This is literally the first case of this ever happening as well, an example not being made of the man is simply dumbfounding.
* OK, maybe the driver's insurance rate also went up.