The best reason I can think of for keeping Pollard in prison is that the next Jew who thinks about giving away our secrets might just remember what happened to Pollard, and decide the punishment is too great.
The above comment reinforces and validates the headline.
Pollard is only in prison today because he is Jewish. That's not a race card being played, it's fact! How many Jews work for the NSA, CIA and mil Intel? How many don't want to? How many Jews in influential places think twice about cooperating with US Intel because of anti-semitism?
It's time to release Pollard. He has more than paid the price for the crime ... unless of course your thinking is "let that Jew boy rot in prison".
Keeping Pollard locked up after 29 years does not hurt Israel, it hurts US Intel.