They've got the firepower. We could've assisted but THEY should've done it. But they didn't for the same reason there will never be a democracy in the region. The monarchies gotta keep their foot on the necks of their people. Democracy, for all of its complications, tends to spread like a virus in a region if it gets established somewhere. There is 0 chance Iran will revert back to the republic it was in the 50's. This is why the countries in the region paid off FatAss too do this for them.
This will end in a mess with a fierce Iranian dicktater that shakes hands with Bone Saw et. al. Iran WAS the democracy in the Middle East that WOULD have spread to the countries surrounding it 70 years ago. WE shut that down and initialized the rise of monarchies (behind a cloak of Islamic Fundamentalism) in the region who took control of the oil and initially kicked foreign countries out.
This region is a cluster of our own making and this failed president and his cronies are re-enforcing it to enrich themselves. We were paid hitman in this pure and simple.