But why do you think they want us to believe that?
It's all political nonsense
Basically they are praying every day that Iran accepts JCPOA (ie. the only thing that can prevent Iran from being a threshold country), but in their propaganda machines they pretend to be against it. This gives some dumb politicians in Iran that are supporting JCPOA the opportunity to bash others who aren't as being Zio supporters! At least this is what they did back in 2015 and it worked to some extent. It no longer works though in 2022 though...
From a global economic point of view, Syria and Afghanistan are not important. Even in terms of crude oil production, Syria ranks much below other countries in the middle east. Afghanistan is even more irrelevant.
Actually both countries have tremendous geopolitical importance that also affects economy even considering energy.
For starters if you look at the world map they are in a very major and important route that passes all through Asia connecting Mediterranean sea (Europe) to all over Asia (including China and Russia) from land. In fact Syria has a couple of very strategically important ports that Iran, China and Russia are using for their trades. As you may know the first step in economic point of view is security of routes.
Additionally when a region is destabilized, all that chaos pours into the whole neighborhood. So for example when Syria is being destabilized and it is US that is doing the destabilization, their forces are going to be hit all around the region which means for example Qatar and Saudi Arabia are hit and that threatens oil and gas supplies.