Yes, because Iran is Muslim it makes them be rivals of Israel when it makes more sense for them to ally with Israel to oppose the Arab muslim nations.
But this is exactly why you are stuck in pre-revolutionary Iran mindset.
Iran cannot oppose Arab nations and rule them at the same time, it is not that powerful and the PR looks bad.
Iran used to oppose Arab nations before the revolution, hence it was allied with Israel and USA.
Now it wants to build an empire, so it needs to somehow appeal to the Arab nations so at least some of them will cooperate with rather than oppose the upstart Shia Empire, because if they have to do it purely by force, the empire will just simply choke on what it bites off.
Meanwhile, there is no more obvious uniting cause to set up between the Shia Empire and Arabs than calling upon Muslim unity against the Great Satan and the Small Satan.
So that's what they do.
Remember, the only thing the Shia islamists would love more than removing the Sunnis, is converting the Sunnis.
But any Iran that wants an empire would be an enemy of America. Iran's interests and America's are at odds. As for a Persian Empire it would be a Persian empire that is Shia Muslim.
Does it? How much does USA care about Arab countries being ruled over Arab strongmen of all stripes, as opposed to a Iranian Empire, provided it would not be overtly hostile to USA or its allies?
Those aren't incompatible, regardless of how silly Islam is and their stupid split between Sunni or Shia. If Iran won everything it wanted it would be a new Persian empire. Just because the state religion of that empire is Islam doesen't mean it's not Persian. I mean are you saying that Persia durring the middle ages was not Persian because they weren't Zorastrians anymore?
What are you even trying to say here? Are you trying to handwave away all the significance of Iran's Islamic Revolution? Yes, Iran is Shia. It was also Shia under the Shah, and even before the Shah.
But it wasn't a Shia theocracy then. It is one now. That's a qualitative difference.
Get it?
But even if it is a theocracy that doesen't prove it will do genocide since again it does allow Christians and Jews to live in it's state.
No one can "PROOOOV" what will happen in the future. On the other hand, it is also an interesting choice of line at "genocide", as opposed to, say, being third rate citizens.
Fuck, even the Nazis weren't intending to genocide Slavs alltogether, just kill off a good chunk of them and effectively enslave the rest.
Do you not understand sarcasm anymore? I did not say America genocided Japan seriously, but the chances of Iran genociding Jews if they do conquer Israel is just as likely as America genociding Japanese after it conqured Japan. They are a hated enemy created by their own stupidity, but the chance of genocide is ridiculously small.
Welp, lucky for Japan, America was not an imperialistic theocracy.
And then there is the elephant in the room that this is a lot more complicated situation.
Of course there is no reason for Shia to go out of their way to genocide Jews. They don't need to.
All it would take for Jews to disappear is wink to the local Arab subjects and look away.
As for Shia Islamic empire and Persian empire. Any Shia Islamic empire would probably also have to be Persian, since most other Muslims aka Sunni are Arab, or Turkish. Most Shia are Iranian. Any Persian empire would need to burn the Arabs and the Turks. If they were not Muslims but Zoroastrians or Christians though they could ally with Israel in the short and medium term.
What good is an empire without subjects? Do they want an empire, or just a big wasteland to call their own? They don't want to burn Arabs and Turks, just break them and rule over them.