Nobody who follows the Middle East can be surprised to find out that Israel is apparently considering an offensive attack on Iran. Why is Israel considering attacking Iran? Because the Iranians are trying to develop nuclear weapons. Who already has nuclear weapons? Israel.
The Iranian government is made up of fundamentalist religious nuts. I’m not thrilled about the idea of them having nuclear weapons. But I’m also not happy about Israel having nuclear weapons — or Pakistan or India or France or Russia or the United States. If you want to get brutal about reality, there’s only been one government so far that has shown the willingness to kill and maim hundreds of thousands of civilians with nuclear weapons — and that wasn’t Iran.
If a war between Israel and Iran (and possibly other neighbors) starts, it seems very likely that the United States will be pulled into the mess. It seems even more likely that the flow of oil to the U.S. economy will be disrupted. Gasoline and heating oil will become massively more expensive, which will probably create cries for price controls, leading to shortages and possible rationing. Even if you disregard to tremendous human cost to the participants, the price for the rest of the world will likely be huge if a full-scale war erupts.

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