This proxy theory is ridiculous. Nobody can give a nuclear device to a terrorist gang and then pretend:"Who done this?". This is designed to put people in a stressed out and agressive disposition. On the other hand Iran is not hiding the fact they are a sponsor to Hizbollah, so they can not, and are not trying to, deny responsibilty of the group actions.
Kerry: Pollard's parole not related to Iran deal (Reuters)
from the article: Let them have nukes