At this point we would be better off nuking Iran.
I get the sentiment, but nuking Iran would not make things better for the US. It would create dangerous power vacuums, allowing even worse extremists to rise. Just like we saw in Iraq, Syria, and Afghanistan. It would further polarize the world against the United States, damaging our position even more than it already is.
The wiser approach is to step back and let the natural power shifts in the region play out. Saudi Arabia and Turkey are not allies of Iran. Together with Israel these powers will naturally counterbalance one another. There’s no need for us to keep pouring money, military resources, and political capital into the region.