Are you including the ensuing occupation of Afghanistan and Iraq?
Even then, I think you're seriously underestimating the number of casualties a relatively low yield nuke (in the context of modern strategic weapons) would produce if it hit a city like New York.
I also recall there being a third or fourth plane that was diverted by a terrorist and perhaps two more crashes. At the time, on the live newscast, there was another plane headed toward the pentagon and one more headed somewhere else. One crashed in a field, one crashed into the pentagon and left a small hole in the wall. There are so many details from the news broadcasts that day that don't line up and don't get spoken about.
Partly the reason why there are so many theories out there about what happened that day is the amount of conjecture in the reporting never got rehashed, there was never an examination after the fact of who said what and why it was or was not the case.
And that's my problem with nearly all of the 9/11 conspiracy stuff - most of it is things where you say, "hmm, that seems a little strange" and then it falls apart completely when you really look into and/or think about it. Like, if you say to me, "The CIA was behind 9/11, they posed as a radical Islamic fundamentalist organization and found some guys who wanted to attack the WTC and bankrolled them and helped them plan and gave them advice on exploiting known problems with US security, and did some stuff to make sure that any investigation would be diverted, and they were successful and flew planes into buildings which burned for hours and then collapsed, killing thousands of people and justifying foreign wars", that's plausible. Could have happened. The CIA has probably done more evil things. Burden of proof is on you, of course, but it could be a thing.
But no, it's always "the towers were brought down by explosives", or "the planes were really missiles", or "jet fuel can't melt steel beams" or "the planes were flown by remote control and all the supposed passengers were just crisis actors" or, "they let random idiot x into the conspiracy for no discernible reason and he spilled the beans" or any one of a hundred improbable, unsupported-by-the-available-facts failures of critical thinking. I mean, I understand the tendency of the human mind, when faced with a chaotic situation with an unsatisfying outcome, to latch onto little odd things about the official explanation and expand them into a whole tale that wraps up the whole thing neatly, but man, this is just exhausting
“Collapse” in the sense of “caving in” can happen to just a part of a building. “Building 7 has collapsed” is shorthand for both “Building 7 has suffered a partial collapse” and “Building 7 is now a pile of rubble” - it’s not hard to understand that in the fog of what was a catastrophic event one is easily mistaken for the other, partially when the other is more “Get this on air now!” newsworthy.
Quite a few more died in the end than a nuke could manage.
This website is quite interesting with footage from major tv networks on the day:
https://911realtime.org/