Journeyman: if you don't want to set yourself up for a lot of mess in the longer term.
Sadly, we're at least ~120 years too late for that. The west has been meddling in the Mideast for more than a century, and the bad feelings run very deep. Many of the religious theocracies in the Mideast would happily do massive damage to the nations of the west if they had the resources to do so, and if they didn't realize that the retaliation would be overwhelming.
But the situation is what it is, and a nuclear Iran is a catastrophe waiting to happen. I agree that the President shouldn't be able to authorize strikes like this, but that is another ship that has long since sailed (and, while it is theoretically possible to fix this, there is no political will to do so here). My hope is that it ends without a larger conflict forming in the short term. The Ayatollah's government made enough enemies of its neighbors that I don't think anyone will be willing to stick their necks out for Iran.