The former head of Israel's Shin Bet security agency has accused the country's political leaders of exaggerating the effectiveness of a possible military attack on Iran, in a striking indication of Israel's turmoil over how to deal with the Iranian nuclear program. Yuval Diskin said Prime Minister Benjamin Netanyahu and Defense Minister Ehud Barak — who have been saber-rattling for months — have their judgment clouded by "messianic feelings" and should not be trusted to lead policy on Iran. Diskin, who headed Shin Bet until last year, said a strike might actually accelerate the Iranian program. Shin Bet addresses security in Israel and the Palestinian Territories only and is not involved in international affairs. Iran says its nuclear program is for peaceful purposes. Israel, like the West, believes that Tehran is developing weapons technology, but there is intense debate over whether international economic sanctions accompanying the current round of negotia...