In recent weeks and days, the divisions over how to deal with Iran and its nuclear program have sharpened. The only undisputed fact is that Iran is developing a nuclear energy program, but after that things get murky.

Israel and some European countries believe Iran is moving toward a nuclear weapons program, but U.S. intelligence agencies disagree. Israel argues that a nuclear-armed Iran poses an existential threat, and there’s much speculation in the media about a possible Israeli attack on Iran’s nuclear sites.

Are we heading toward a self-fulfilling prophecy or is some of it strategic bluster designed to spook Iran?

Several former and current leaders of Israel’s military and intelligence establishment have come out to warn against an attack on Iran. Efraim Halevy led Israel’s National Security Council and Mossad, Israel’s national intelligence agency, from 1998 to 2002. He tells weekends on All Things Considered host Guy Raz that he doesn’t believe there is an existential threat to Israel, but that there are threats the nation should not and cannot be expected to bare.