Iran has been at war with America since 1979. They have killed hundreds of Americans. We have a real interest in ensuring that they don’t get nukes. Speaking of which if you think oil is expensive now, just wait for a nuclear Tehran
We overthrew their government in the 1950s and installed a pro-Western puppet; they reversed that in 1979 but we’ve never been at war with them. If anything, we killed far more Iranians by arming Iraq to the teeth during their 1980s war - and then Americans had to fight those Iraqis armed with those same US weapons in the early 90s in Gulf War I.
I don’t want a nuclear Iran, but I didn’t want a nuclear Red China, India, or Pakistan either.