An infatuation with economic sanctions, applied against countries Americans do not like such as Iran, loses sight of the concept that sanctions are only a tool for trying to accomplish some other objective, rather than being an objective in their own right. This lack of understanding shows up mainly in the tendency to think of the economic pain that sanctions inflict on the target country as an end in itself, as if we lived in a completely zero-sum world in which pain for a country we don't like equates to gain for us. We do not live in such a world, and pain for someone else does not directly mean any gain for us.
We also tend to overlook, however, how our own sanctions inflict direct costs on ourselves. Think about this partly as a matter of economic theory. Sanctions represent government interference in the workings of the market. They prevent enterprises from doing what the market would otherwise determine to be the most efficient way of supply meeting demand. The interference inevitably entails added costs, which we Americans share.