The fanatics want armageddon, the clerics want a big gun that they can use to become a world power and the people doing the killing-- it's anyone's guess what they want
Israeli leaders and generals certainly don't mind smiling knowingly every time a top Iranian commander meets an untimely accident, which has been happening surprisingly often these past few years, but the explanation is likely to be more complicated than Mossad secrets agents operating behind the scenes. The logistics of infiltrating people on the ground to carry out assassinations isn't easy, anyone viewing the chronology of the Dubai hit for one man in a hotel room, can only begin to imagine what it would take to pull off more complicated operations in Iran, which sees far less foreign travelers and has much tighter security.