The Wall Street Journal explains.

Excerpt:

Events are fast pushing Israel toward a pre-emptive military strike on Iran’s nuclear facilities, probably by next spring. That strike could well fail. Or it could succeed at the price of oil at $300 a barrel, a Middle East war, and American servicemen caught in between. So why is the Obama administration doing everything it can to speed the war process along?

The article lists various elements of Obama’s weak stance against Iran, then continues:

[…]All this only helps persuade Israel’s skittish leadership that when President Obama calls a nuclear-armed Iran “unacceptable,” he means it approximately in the same way a parent does when fecklessly reprimanding his misbehaving teenager. That impression is strengthened by Mr. Obama’s decision to drop Iran from the agenda when he chairs a meeting of the U.N. Security Council on Sept. 24; by Defense Secretary Robert Gates publicly opposing military strikes on Iran’s nuclear facilities; and by Russia’s announcement that it will not support any further sanctions on Iran.

In sum, the conclusion among Israelis is that the Obama administration won’t lift a finger to stop Iran, much less will the “international community.” So Israel has pursued a different strategy, in effect seeking to goad the U.S. into stopping, or at least delaying, an Israeli attack by imposing stiff sanctions and perhaps even launching military strikes of its own.

How do you think Iran would respond to such an air strike? Their entire land force would be left largely intact. Do you think they are just going to take that and do nothing to retaliate? This is a nightmare.