(open question as to how much the October 2023 attack is the fault of Iran, specifically?)

Also during this one of their missiles hit a target 4000 kilometers away, much further than they were claiming they had. That's far enough to hit Europe if it had gone in the other direction.

To me it's looking like the stability was an illusion.

It was also reported that during negotiations before this war, Iran had offered 100% of all nuclear material to be surrendered to the USA, to prevent a war.

Also, Marco Rubio said directly that Israel was going to strike anyway, and that we had to respond. He later “clarified” that it was. 100% Trumps call.

So - if the stability was an illusion, it’s because Trump and Israel are unstable, right?

But, yes

So why the hell are we there? We didn't build a coalition. We didn't really justify our involvement. Trump and Trump supporters insisted on isolationism, pulling back from being the world police, ignoring even heinous invasions like Ukraine to save a few pennies, but suddenly Iran has insulted us through its existence for far too long?

Bullshit.

Keep in mind, Iran was likely to evolve in some way in the next few decades as a result of their impending water crisis. Waiting for a better opportunity would have been the smart choice.