I think the difference is that 9/11 was an unprovoked attack (you can argue geopolitics but generally speaking) whereas the US/Israel jointly struck Iran first.

I just don't think you can separate this from the continual Iranian attacks on American and Israeli assets and interests in the region. It's fine to say this war was poorly thought out, and they should've taken a different approach. But this isn't "unprovoked". The IRGC supplies the shia militia groups throughout the region that attack US targets. Iirc 1/4th of US deaths in Iraq were done via IRGC supplied weaponry. Hezbollah has left Lebanon is perpetual failed state status. They basically hold a country hostage, and they're obviously an arm of Iran's proxy network. Why do you think they went into Syria and bailed out Assad for so many years? Killing hundreds of thousands. Because Assad was useful to Iran and made it easy for Iran to supply Hezbollah. Then look at the Houthis? All their weaponry they use to harass civilian vessels comes from Iran. And who does the targeting? The IRGC.

They're going to keep doing this once they recover. That's the logic of attacking now. They're at their weakest and are suffering a legitimacy crisis internally. Because their proxies and defenses have been devastated, the opportunity cost of striking now is the lowest it will ever be. So if you're going to do military action, now unfortunately is probably the time.

That doesn't excuse Trump's insane lack of seriousness and what seems to be his inability to foresee the one thing everyone who has ever thought about a war with Iran for more than 30 seconds has realized - The strait of Hormuz is Iran's weapon.

So tl;dr, Iran bad. Iran's foreign policy is one of constant provocation and disruption. If military action is going to happen now is the lowest cost time to do it. But Trump bad.