This is what happened to SQ passengers in January in Baku (they had no visa to enter Azerbaijan) and stayed at the airport for hours

When this happened previously a few years ago the Israeli passenger claimed he was treated incredibly well (in fact given a gift by the security people I think).

You do realize that the Iranians are largely a cultured people? They would not do this.

An Iranian as an individual may very well be cultured. Iran as a government hates Israelis. Airport authorities are not acting on their own personal opinions but on the opinions of the government of Iran. No different than an Israeli may very well like to hang out with an Iranian, but TLV border control would likely not allow an Iranian citizen into the country

But we also wouldn't leave them to fend for themselves. We would isolate them and treat them well. Same as Iran.

I guess you have higher hope for humanity than I do

During the 1930s Germans were considered to be at the pinnacle of global culture and look at what they did to our people and others before and during the Second World War. Unfortunately, when fed a steady diet of genocidal hatred, even the most "cultured" of nations can perpetrate unspeakable crimes and cruelty onto others.

The fact that Iranians are "cultured" is meaningless in this situation as is proven by Jewish experience throughout the ages.

Done...
Wonderful flights on LX. Got *G, last month I qualified for another year of LY GL with 1850 points.

There are Iranian citizens with relatives in Israel. Some of them even travel repeatedly between Iran and Israel -- via Turkey has been the most common in recent years if using common carrier scheduled commercial air service.

I doubt that in the event of an emergency landing in Iran that the Iranian authorities as whole would be anything but reasonably hospitable and fair to all passengers. These people pride themselves greatly on being historically hospitable to those travelers in need regardless of background. And then they'd come back and say "see, I told you so".

So, in a real world scenario, you would feel perfectly comfortable being on an a/c making an unscheduled m/x landing in Iran as an Israeli passport holder, or would you sit there quietly in order to avoid being noticed by Iranian officials and hoping what you wrote above would be true if they caught on you're Israeli?

If it were an emergency landing due to a plane mechanical/fuel situation and I was being deplaned at say THR as a result of the situation and only had an Israeli passport -- be it fake, fraudulently-acquired, otherwise real but illegitimate or whatever -- I would expect to be reasonably comfortable on the ground by that point. YMMV, but I'm not a nervous nelly type who breaks out sweating over worst-case fantasies whipped up by whomever; and I have no doubt that Iranian authorities ordinarily wouldn't want bad PR under such circumstances. I wouldn't go around waving my passport until asked for it, and I may not want to make mention of some of my past work, but I would be surprised if anything worse would happen under such circumstances than perhaps being given priority to be sent out of there. [I would perhaps be more concerned if I were Hamid Gul or Mahmood Ahmed and I had a Pakistani passport or of I were Iranian-Israeli Shaul Mofaz -- but those too aren't real world scenarios. ]

There have been Israeli passport holders on at least one common carrier flight that had a MX situation and landed in Iran. I don't recall those passengers having problems any different than the other people on board without visas or visa-waivers for Iran who didn't have Israeli passports.

I have landed in Damascus about 14 years ago. BA cancelled my flight, the next 2 days were Chag, and without looking too closely, I agreed they could rebook me the following day.
Then they rang me back to say that I had ordered KSML, did I know the flight went through Damascus.
I told the crew I wouldn't get off under any circumstances, moved to a different seat (manifest listing KSML), and admit to having been slightly nervous.

Why only fake or fraudulently acquired?

I didn't follow this story exactly

Only? No, not only; the section of the post quoted covers more than just those two.

Fake, fraudulently acquired, otherwise real but illegitimate. The question is - why not a real passport that was acquired properly and is legit?