Given the threat that Islamist theocratic regimes pose to America and its allies,
why are we opposed to destroying them?
Because there's no good reason to purposely target and kill civilians just because they happen to be Iranian.
Our mistake is trying to occupy them.
There's no need for that--we just waste American lives doing that--
Correct. There's no need to repeat Dubya's mistakes of "WMDs in Iraq" (a lie) and "leave the oil" (just plain stupidity).
but there's little downside to reducing them to rubble.
... except for the slaughtering of innocent Iranians, of course.
Some of us--not enough of us--remember 9/11,
I remember 9/11, and I'm not even that old. I was in grade school at the time.
and Jihadist Islam has not come remotely close to paying for that yet...
I still have suspicions that 9/11 might've been an inside job (at least to some extent).
or the 10/7 attack on Israel either.
That attack (while Hamas was the puppet on the string) ultimately stems back to Iran, so Iran is who ultimately needs to be dealt with regarding that attack.
It's not about any particular nation.
They're all shitholes by any standards of decency.
Are they really any worse off than the Democrat-controlled shithole cities in our own nation?
It's about Jihadist Islamic theocracies in general.
They seriously diminish our world.
The fundamentalism of Islam is indeed dangerous, same as with any religion's adherents who embrace such fundamentalism.
People are concerned with the suffering of Muslim civilians in the Middle East,
Yes. People generally don't wish to see innocent civilians suffering. With that being said, plenty of people WILL make exceptions for certain groups of innocent civilians who they HATE (whether that be Israelis, Iranians, Christians, MAGA supporters, Afrikaners, etc etc...)
but Jihadist Islamists have never worried about harming civilians---
including their own.
True.
We need to deal with them,
By committing genocide against Iranians?
and also deal with our theocratic Christians at home.
By committing genocide against USA's Christians?
Theocracy reduces its advocates to sub-human mutants.
So all Iranians and Christians are "sub-human mutants"? Hmmmmm........