If Israel wants to strike Iran's nuclear capability, then the stakes are very high. The Israeli strike package has to a.) overfly a signficant amount of airspace belonging to other countries, b.) penetrate the Iranian IADS network c.) do it with no losses (captured Israeli pilots would be a major bargaining chip and propaganda coup for Iran), and d.) destroy all/most of Iran's nuclear weapon stockpiles, relevant R&D capability, and production facilities in a single mission. Going back a second time to destroy any missed or overlooked targets will probably not be an option.
Anything the Israeli strike misses will be guarded and protected even more closely, and it would stall further international efforts, since Iran would probably bar further UN inspection. And, assuming Iran has completed a weapon by the time of the strike, there is the possibility of this /warhead being used in a retaliatory attack. How successful such an attack would be is open for debate; but the chance, however slim, of a nuclear counter-strike on Tel Aviv is one Israeli policymakers will need to consider.
Plus, an angered Iran would likely step up its effort to subvert Israel, supplying Hesbollah and other insurgent groups with weapons, training, financial support etc.
Bombing Iran will not be as (relatively) simple as another Osirak. The risks are greater, the stakes higher, and the outcry will be stronger. Iran may be a "rogue nation," but an uprovoked attack will not improve Israel's stature on the world scene.
It's up to Israel and the clock is ticking...
T68, as for "hypocrisy," the core of this (complicated) issue seems simple to me. Turkey is a nation with a clean track record and closes ties to the US. The odds that they're going to go nuking their neighbors or US troops is fairly low.
Iran on the other hand, is a "wild card," a nation that has fought wars with its neighbors in recent memory and has a clearly established, oft-repeated policy of anti-Isrealism and anti-Americanism. Allowing them to have nukes is a far greater threat to US interest than allowing long-time NATO partner Turkey to have them, even though Turkey's current politics are in some turmoil.
Is it fair? No. But is it pragmatic? I'd say yes.