Basic psychology. Iran has tried to kill these rebel forces since the Arab Spring, and now you think they will suddenly become friends of Iran once in power? Not going to happen.

As far as Lebanon goes, decades of wars are mainly a result of Lebanon's dysfunctional sectarian political system. But having Hezbollah run around and exchange fire with Israel doesn't improve the already bad situation.

But basically psychology vs the core of their foundational ideology? Idk, their ultimate goals are clearly similar to Iran's. Former enemies have become allies many times in this region.

Decades of wars have nothing to do with Israel invading the country and installing the extreme right wing Fascist inspired Phalange party into power after 1982? The very event which led to the founding of Hezbollah? Okay

Iran are shia and the rebels are sunni - two groups that hate each other and have been battling each other throughout the middle east.

Hamas is Sunni and Iran is Shia. Sunni and Shia don't really matter in these contexts. And if you think Islamist rebels hate Shias more than they hate Israel and the USA, it's a toss-up, imo

If it didn't matter then all the arab nation would all be aligned, but it matters and they aren't. The Saudis vs Iran is still driving a lot of the faction movement in the region.

The Sunni world is mostly fine with Israel, other than Hamas of course, which is why Hamas had to work with Iran (although it seems like it backfired on Iran)

I feel like you are intentionally saying ridiculous things, so really no point in talking. The idea that "the Sunni world is mostly fine with Israel" is such a ridiculous idea it's not worth discussing further with you.

Ah, lets see, Sunni countries with diplomatic relations with Israel:

Egypt, Jordan, UAE, Sudan, Bahrain and the Saudis (through back channels)

It's just a fact, there's absolutely nothing ridiculous about what I said, if anything Sunni regimes are more worried about Iran than israel.

Iran has been propping up Asad's regime for years now by providing weapons and fighters from Hezbollah and Shia militas in Iraq in the fight against the rebels.

The Iranian embassy in Damascus has been stormed by rebels and protestors as we speak.

Time will tell, but my point stands: Iran and its proxies (and Russia for that matter) are the only meaningful actors interested in keeping the area around Israel destabilized.

I am aware of the history. But your assertion that only Iran wishes to attack Israel is untrue. Al-Qaedas very foundational idea was to hurt the Saudi government for allying with the US (and by extension Israel). And these rebels are all former Al-Qaeda or worse.

You think they will be pro-Western before they will be anti-Israel? It's a very risky gamble to make.

They don‘t have to be pro anything. Al Julani’s family themselves had to flee the Golan heights due to Israel’s occupation, so I doubt they‘ll become best friends. All I‘m saying is it weakens Iran and that‘s a good thing. Few in the area are enthusiastic about Israel, but most of them are at a point where they just want to move on.

But most of the countries in the area are dictatorships, where they don't need to abide by public sentiment. Public sentiment in almost all these countries is that they want to stop what Israel is doing to the Palestinians. Egypt's one and only election was to elect a leader who promised to change that, and he was of course deposed by the military (with Israeli help). If the rebels do set up a government where the voices of the people are heard, it will be bad for Israel (and vis a vis, good for Iran, presumably).