I'm not happy about the US starting a war with Iran. I'm not falling into the same trap I did during the second Gulf war. The whole phony WMD thing and all that. I'm old and I have a long memory. So I'm skeptical of any use of force internationally.
That being said, two things are on the table.
First. Iran can never ever EVER have nuclear weapons. This regime has been and is dead set on obtaining a nuclear weapon. A nuclear armed Iran is unacceptable. Period. You may disagree with this, but for me this is non negotiable.
Second. Iran repeatedly asserted their ballistic missile program was for purely defensive purposes. This was exposed as (another) lie on Iran's part when they launched two missiles at Diego Garcia approximately 3,800-4,000KM from Iran. Exceeding Iran's "self imposed" 2,000 KM limit.
Now is, Diego Garcia a legitimate target of war? To be honest I would say yes, it is. The US has/can launch strikes on Iran from this base. It's a military instillation from which attacks are being staged. But that's not the point.
The point being, if Iran has missiles or even the technology to build missiles that can reach Diego Garcia, it has the missile technology to reach targets like Rome, Athens, Vienna. Along with potentially Paris and Berlin.
You combine this with the 440Kg of 60% enriched U-235 that Iran has (source IAEA) which can be made weapons grade in a matter of weeks and you have a nation state that is very much potentially nuclear capable with the missile technology to strike major population centers in Europe.
This, again is unacceptable. Iran has the technical capability to produce multiple nuclear weapons. It has the means to deliver those weapons to multiple European targets.
The totality of the circumstances, especially given Iran's behavior on the world stage over the past 40+ years would lead a lot of reasonable people to believe Iran does not have the best of intentions when it comes to it's missile and nuclear programs.
If a nuclear armed Iran with ballistic missiles that can reach European population centers is not acceptable, and Iran will not accept terms that eliminate that threat, what are the options? Either let them have the bomb and the means to use it, or eliminate that threat.
I don't like that the US is bombing another country to hell. War is one thing. Bad. I don't like it. I think it stinks.
But that being said, I see the reason for it. I wish there were better options, but a nuclear armed Iran with said missile technology isn't one of them.