It's curious that people on this forum think Iran has the right to develop their own nuclear weapons without consequences, at same time they think it's wrong that USA and its allies try to suppress this threat, considering western countries are going to be the main targets of Iran and its sympathizers, in case they succeed growing stronger.
It would be a stupid move from western countries to let their self-declared enemies continue accumulating more military power just to be annihilated in the end. And hypothetically, in case that happened, these same people who are blaming and morally disapproving USA and Israel right now, would just say: "they deserved it all the time".
This is not democratic nor peaceful, the 2 things the countries you list talk about the most. You can't control the whole world, and trying to do so will only result in severe consequences in the long term. Unfortunately, most people are no longer capable of thinking long term..
Does Iran want democracy? Does Iran want peace? Look the internal policies of this country, how the society is ruled, organized and managed by the authorities, the treatment women and children receive and how the punishment system works.
It does not matter what Iran wants. If you want democracy and peace, then you don't interfere in someone else's affairs unless they invite you to do it. If a country is a dictatorship and wants to stay a dictatorship, that is their decision to make.
It's not about controlling the whole world. It's about not allowing the ones who nourish hate for you and your way of life to gather enough resources and power to destroy you in the future.
That is the literal definition of control.

See? That is why there is a war going on, because all the other measures, tools and possibilities of ceasing the conflict have failed. I'm humble enough to consider the possibility I could be mistaken or deluded regards the benevolence of each characters involved on this story, but from what I observe in reality, Iran wants to destroy Israel and western lifestyle, it's not a secret for anyone. If Israel was the initial aggressor, Iran would be already nuked a long time ago, and then the consequences would have been really devastating for civilians.
"Doesn't matter what Iran wants", as if they could act as they wished and the other side didn't have the right to react. The fact Iran is a perverse dictatorship where 9 years old female children are forced to marry grown up men, while women are subjugated during their whole lives doesn't matter too, I suppose...
The first step to revert the current situation would be to eliminate the feeling of envy in the hearts of the men. That is the root of the conflicts on the region. Since the biblical times this story is told through the events involving Abraham, who had two
two sons, Ishmael and Isaac. The first with his wife's servant, Hagar, and the second with his wife, Sarah.
God blessed both lineages, but Ishmael's lineage allowed the feeling of envy grow stronger, obfuscating their judge and vision against their brothers. You don't have to take it literally, but in some stance, it gives an interesting clue on what is going on.