Perhaps forcing regime changes on other countries shouldn't be a quick decision.
Just recently Trump tried to troll the Germany’s leader for it and only got a “Thank you for defeating us”.
The truth is that Iran’s regime is indeed a very shitty one and a lot of people have grievances with it but the problem is, this is about Israel and they are not any better and didn’t stand at a higher moral ground with their illegal occupation and actions that many consider genocidal.
Relative to their last, America-backed regime? I don't think you're looking at this from an Iranian perspective at all.
and a war that killed 400,000 Americans.
You want to repeat that history?
1939, Nazi Germany starts fucking around and nobody does anything about it and then we have WWII on our hands.
You've totally missed the point. It's precisely because we didn't "properly" bomb Germany to stop that first invasion of Poland, that WWII happened and we lost 400,000 Americans, 6 million Jews etc.