Much as I hate to back the current administration, there don't seem to be a lot of easy answers.

A "no-fly" zone is something you can set up once you have already destroyed an enemy's air defense systems. It's what we did after we won the Gulf War. It's not so easy to start out with one.

Supporting the rebels with arms and other things would require a long-term commitment, and frankly, the U.S. isn't so hot at those anymore.

Also, we're dealing with Iran in much the same way as we used to have to deal with the Soviets: they're behind a lot of this trouble, and the goal isn't democracy after the dictators are knocked out, it's to install their chosen dictators. Makes things even more complicated.