There was an off-hand joke in the most recent episode about this, and if I remember correctly, there have been similar jokes before.
Prof. David Kaiser, an MIT professor who is both a physicist and a historian (aka the coolest guy possible) has done extensive research on this, and his work is particularly interesting because he has the expertise in all the relevant fields do dig through the archives.
It's been a long time since I've read him, but he concludes that the physics was widely known outside of secret government operations, and the fundamental challenges to building an atomic bomb are engineering challenges -- things like refining uranium or whatever. In other words, knowing that atoms have energy inside them which will be released if it is split was widely known, and it's a very, very, very long path engineering project from there to a bomb.
This cultural understanding that physicists working for the Manhattan project built the bomb is actually precisely because the engineering effort was so big and so difficult, but the physics was already so widely known internationally, that the government didn't redact the physics part of the story. In other words, because people only read about physicists' contributions to the bomb, and the government kept secret everything about the much larger engineering and manufacturing effort, we are left with this impression that a handful of basic scientists were the main, driving force.
Jesus yeah that's a great point re:Musk/Twitter. I'm not sure that it's true as you wrote it quite yet, but I would definitely agree that it's, at the very least, an excellent prediction. It might very well be functionally true already as a matter of political economy, but it hasn't been tested yet by a sufficiently big movement or financial crisis or whatever.
+1 to everything that you said about organizing. It seems that we're coming to the same realization that many 19th century socialists already had. There are no shortcuts to building power, and that includes going viral on Twitter.
I've told this story on the fediverse before, but I have this memory from occupy of when a large news network interviewed my friend, an economist, but only used a few seconds of that interview, but did air the entirety of an interview with a guy who was obviously unwell and probably homeless. Like you, it took me a while after occupy to really unpack in my head what had happened in general, and I often think on that moment as an important microcosm. Not only was it grossly exploitative, but it is actually good that the occupy camps welcomed and fed people like him. That is how our society ought to work. To have it used as a cudgel to delegitimize the entire camp was cynical beyond my comprehension at the time. To this day, I think about that moment to sorta tune the cynicism of the reaction, even to such a frankly ineffectual and disorganized threat as occupy. A meaningful challenge to power had better be ready for one hell of a reaction.