On the one hand, I tend to agree with various responders that his knowledge is passe and irrelevant. On the other hand, this sentence has much more to do with sending future spies and traitors a message. Bottom line: all he has done in recent years is provoke the system.
U.S. House Speaker Boehner brushes off call for his ouster (Reuters)
from the article: Vanunu to return to prison for violating the terms of his parole