Dude calm down. Only someone very naive will think the US is scared of Iran.
North Korea also claims the same thing . Lol
The real big global players like China (who is the country that can actually threaten US dominance globally this coming decade ) don't even claim the US is scared of them. Lol In fact even Russia wouldn't claim the US is scared of them . And Iran is nowhere near this 2 powers. You guys can't just assume that the US will invade every single country that has conflict of interests with or that they clash with. There are several things to consider in geo politics before launching a war, and timing of events also needs to be taken into consideration.
Today's world is different from just 20/15years ago. The rise of China this past decade for one has changed many things, and the US can't afford to waste time on regional powers like Iran. Had Iran for example attack US forces like they did recently just 20years during the early 2000s after 9/11 attacks and build up to Afghan/Iraq wars and when China was starting to rise and not a threat, then you can be 100% sure US reaction would have very different, a war would have ensured.
So we have to analyse things for what they are, instead of making emotional statements.