Which is why they've all been cozying up to Israel recently, since they pose the only real military danger to Iran comparable to what was lost when Iraq switched sides.

There's a bit more to it than all this.
Nobody wants a nuclear Iran. The US took a potential nuclear Iraq off the chessboard but since then some US administrations have been somewhat naive about the mullah's long term plans and have been inadvertently funding Iran's weapons programs. (For some other poster who thinks he's going to drop in here with a sick burn "fact check": Don't. Money you don't have to spend on say, food, can get spent on building missiles and centrifuges).

A nuclear Iran is a far more scary thing that Iran's army, which was never a real thing. Recall that they still fly reverse engineered Phantoms and Tomcats. Their *only* means of projecting power is through their terror proxies. Shut those off, Iran has nothing other than a lot of oil.

The Arab nations - Sunni - recognize that since they can't beat the Israelis that it's a far smarter thing to team up with them against their common enemy, Iran. That was the entire basis of the Abraham accords.