Russia would not have invaded Ukraine if Ukraine has nukes. The US would not have dismantled Iraq, Afghanistan, and now Iran if they had nukes.
You look at a country like North Korea and they get the red carpet despite have an incredibly oppressive regime and spending millions on cyber attacks and corporate espionaige. You know why? Because they have nukes.
It's not a question of "trusting" Iran. Iran with nukes is more geopolitically stable situation than Iran without nukes. As it stands today, Iran without nukes, means that Lockheed Martin gets to fleece another 10 trillion dollars from the American public for the next decade.
This is one of the most wrong things anyone has ever said. If Iran successfully develops a nuclear weapon, it would almost certainly compel its regional rivals, namely Saudi Arabia, Turkey, and Egypt, to pursue their own nuclear weapons to maintain a balance of power. A Middle East with multiple nuclear states is a nightmare scenario, dramatically increasing the chances of miscalculation or nuclear use.
Iran with nukes would almost certainly act far more aggressively just like Russia has with Ukraine.
Though your point about the US being more capable of destruction than Iran is obviously true. China also is more capable of destruction than Iran, as are Israel, Russia (as we see today with their unprovoked invasion of Ukraine), and many others.
Beyond that, there are moral questions about the use of nuclear weapons. I know people who think it would have been more moral to force a Japanese surrender via many Japanese and American soldiers to die during an invasion of Japan, than for the US to kill civilians with nuclear weapons. I'm not sure I agree with that line of thinking, but I can't dismiss it either.
The incident took place in 1945 when Secretary of War Stimson, visiting my headquarters in Germany, informed me that our government was preparing to drop an atomic bomb on Japan. I was one of those who felt that there were a number of cogent reasons to question the wisdom of such an act. The Secretary, upon giving me the news of the successful bomb test in New Mexico, and of the plan for using it, asked for my reaction, apparently expecting a vigorous assent.
During his recitation of the relevant facts, I had been conscious of a feeling of depression and so I voiced to him my grave misgivings, first on the basis of my belief that Japan was already defeated and that dropping the bomb was completely unnecessary, and secondly because I thought that our country should avoid shocking world opinion by the use of a weapon whose employment was, I thought, no longer mandatory as a measure to save American lives. It was my belief that Japan was, at that very moment, seeking some way to surrender with a minimum loss of “face.” The Secretary was deeply perturbed by my attitude, almost angrily refuting the reasons I gave for my quick conclusions.
This isn't true at all. You don't need to bomb civilian cities to end a war. The Japanese government, specifically the emperor had already indicated they wanted to negotiate. They were already well aware they couldn't win the war.
There is far, far more evidence that the U.S. just couldn't help itself and wanted to demonstrate our/their new weapon:
"The Japanese had, in fact, already sued for peace. The atomic bomb played no decisive part, from a purely military point of view, in the defeat of Japan."
- Chester W. Nimitz, Commander in Chief of the U.S. Pacific Fleet
In true U.S. fashion, we had to create a boogeyman to commit some atrocity in order to achieve absolution for the evil we inflicted upon our fellow man.
But hey, don't take my word for it:
* https://en.wikipedia.org/wiki/Debate_over_the_atomic_bombing...
