The original NCIS investigation apparently revealed that the two of them were trying to sell this information to Pakistan and South Africa -- neither of which had anything remotely to do with Israel at the time.
Caspar Weinberger called it the most destructive acts of espionage the U.S. had seen in decades. Do a Google search on "RASIN Manual" to see what Pollard's most egregious acts of treason entailed.
This is an important point not often mentioned. Israel acts in what it percieves as its own best best interests and if these include passing classified stuff sourced from the US to China, or Russia, or whomever, they’ll do it without batting an eyelash. There is no loyalty here. Sentimentalists should remember this..