They are focusing on issues they have universal condemnation, and are undeniably the responsibility of the current regime.
If you try to rally around big picture issues, you better be sure everyone seems the same big picture, and agrees on what should be done and how to do it and who should do it.
There are people who think the war in Iran is gong great. There are those that think it's going poorly, but that we can and should win. There are those that recognize it's a disaster, but believe that it was necessary, or at least desirable to take action against Iran, just not like this.
But everyone hates high gas prices.