Iran seems to believe they can win by maximizing on the amount of people who they can get to hate them . Allah Fubar!
Think in terms of Shia millennialism. In their minds they’re fighting the world fight to bring in their form of a apocalyptic event. That’s one of the reasons they can never be allowed nuclear weapons. Most politicians (particularly European ones!) can’t or won’t understand that they think that way. The college\university political science model of the “rational actor” doesn’t work here.
The Iranians are attacking countries with Sunni Muslim regimes. Sunni and Shia already regard each other as Hell bound heretics.
By Iranian logic, the triumph of Islam requires the destruction of the Saudi and the rest, not just Israel and the USA.