Bombing of US marine barracks in Beirut in 1983 was funded, and organized by Iran. Just take half day off, and read a bit on the role of Islamic Republic in Middle East in the past 40 years. I guarantee your stance of "US attacked first" will change to the "unclear" at the least.
This kind of thinking won't get you very far and won't ensure peace in the region.
The Lebanese Muslims at the time were furious that the Sixth Fleet was constantly shelling Shouf. At the time the Phalangists, with Israeli help, had recently murdered 3500 women and children at the Sabra and Shatila refugee camps.
There were and are plenty of grievances to go around in Lebanon.
Lebanese muslims are not a monolith. Shia and Sunni have very different opinions on things, and the 1983 barracks bombing was not done by the sunnis.
Anyway, what I am trying to say is that treating war with Islamic Republic today as some sort of consequence of the June 2025 is a mistake.
I did not say that Iran started its war in the shadows with US in 1983, I just showed that the scope of the conflict is not limited to the past two years.