An all out war with Iran would be a war on so many fronts
1. Iran funded Hezbollah Vs Israel that pulls in Lebanon + Arab & Muslim sympathy.
2. Iran allied Hamaz Vs Israel = Arab & Muslim sympathy.
3. Iraq & Syria Shia's controlled by Iran.
4. Strait of Homuz closed for the duration of war will see world oil prices sky rocket.
5. All Saudi oil facilities are within range of Iran's missiles.
6. Iran allied Yemen's Houthi rebels Vs Saudia Arabia.