Iran is a mere stepping stone. The PNAC (Project for a New American Century) 2000 document is an instructive study. The real targets though have always been Russia and China, who are the greatest threats to the dying American empire.
All one needs to do is look at the locations of the NATO bases surrounding Russia and China.
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The American-Israeli-Saudi-Qatari alliance wants their oil to supply Europe via a pipeline through Syria. Russia, with Syria's help, would like to do the same. That's why Russia was forced to intervene in Syria, to keep the proxy war, that the U.S., Israel, Saudi Arabia and Qatar started and funded, from completely destroying Syria.
The U.S. creating this quagmire in Syria for the past 8 years is also why Russia pressed on with their alternate plan: Nord Stream 2, which the U.S. has likewise done as much as possible to sabotage.
This is a big part of why the U.S. wants war with Iran. Of course the counterfeit Jewish-state of Israel in the Middle East is likewise a big part of this.
But really, if anyone is looking for the guilty party, they need only look into a mirror. We let this happen on our watch. That's why sleeping on watch is a capital offense.