First of all, we didn't GIVE Iran money. We returned it; it was theirs. So stop with that. The US can't do "asset forfeiture" on money just because we don't like how someone will spend it. You can make the same case for Reagan; but his "giving" of money to Iran was many times more.
As for the deal with Obama, it had done exactly what was expected. No bomb grade uranium, and not very much. Limited centrifuges, etc.
If Iran has designs on the US, they sure hide it well. They haven't done anything on US soils since.............forever. Israel has been nickel and dimed by Hamas and Hezbollah; but no direct attack from them. Perhaps Iran is more bark than bite.
It is NOT the right thing to do to conquer a country, kill thousands of their civilians, just because of their rhetoric. We've actually had Russia and China do all kinds of non-military mischief to us. But we don't talk about ending them. Why? Well, Iran is (perhaps) weak enough to conquer. Russia and China not so much.
Picking battles because a country is small enough and mouthy enough just isn't a great political strategy.
But then Trump doesn't have anything approaching strategy. Bull/China shop.
Oh, and you can read what was going to be a separate post but appears below, Russia is providing Iran with INTEL and DRONES. They see a golden opportunity here- a proxy to annoy us. We're running low on Tomahawk missiles at a few mi each.
And Trump started this war while in talks with Iran. And they seemed ready to make some nuclear deal, much like the one we HAD with Obama. So, if they're an existential enemy with infinite resolve. why was Trump talking to them in the first place? The timing of this attack screams wag the dog. There was no suddenly occurring pressing need to attack at this exact moment. And you haven't even hinted at an acute reason; just that we've been involved for 20+ years.
Here's the post regarding Russia's involvement:
Another version was in a Miami paper; but it was taking a swipe at A. Deluna, a Florida rep who's a Trump sycophant.
And China has an economic part with Iran, too. Don't know how much is happening now. FYI, arrangements between China and Iran date back 2500 years. So there's that.
So, we're at "war" with Iran, with instructions not to call it a war. They have various agreements with Russia AND China. The one with Russia is currently active. This pretty much makes it a world war. All the major players have dogs in the hunt. And many minor players are on the field too.
It will take great diplomacy to smooth things out, something dearly lacking in our admin, as well as Russia's and Iran's.