Because they understand how transformative this war will be? We aren't players on the geopolitical chessboard to see how, why or what pieces are being moved. I understand that it's a difficult situation for them. The West desperately wants this war but they(Iran) also cannot maintain restraint for forever. The prodding from Israel and it "allies" won't stop until there is retaliation.
I don't think the west wants war. Of course, the war hawks like Graham and Haley do. But with elections coming up, I think the Biden administration would prefer to avoid it because the people have never wanted war.
It's possible the west is afraid of Iran. We've had recruitment problems for a while, and it's only getting worse. We've proven how mighty we are by being absolutely ineffective against Yemen, a country that has been dealing with famine for years. ِAll we have done on that front is disrupt trade for ourselves, making our own products cost more at home because Yemen is now targeting US and UK ships. Has been for months. Our army is like a dinosaur. Our billion dollar battleships can get eaten alive with $10 - 20,000 worth of suicide drones.
There are more issues, but I digress. We are not the superpower we once were. Add to this that the dollar is on life support. Constantly sending billions to Ukraine and Israel requires printing more, only making it weaker. The more dollars in the system, the less valuable it is.
The problem with Iran being a good guy is prophecy says this is where the antichrist will emerge from.
source
Isfahan is modern day Iran.
Iran is no savior. In fact, they could be working with Israel and
all of it is theater. US does whatever Israel says like a dog on a leash, so count them out. This is what I'm saying, whose telling the truth? Israels not. But does this make everyone else credible?
No, everyone has their own agenda.