The people who KNOW are the ones who've consistently voiced their opposition to his pardon. You can bet that it's on THEIR word, along with explanatory details, which has convinced previous presidents from acting on Israel's requests. By the way, Israel was more ruthlessly complicit that hasbara would have you believe.
Northern California wildfire doubles in size, displaces thousands (Reuters)
from the article: Netanyahu makes official request to Obama: Free Pollard