I don't see how Stark is socially corrosive. The guy may be an unrealistic ideal of a genius. He may be a bit of a *****e bag.
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He spits in the face of Neo-Con political ideals and the military industrial complex if he feels they are not doing things that are for the good of the people.
Which is problematic in how it is portrayed. In the first movie, Stark abandons weapons development to build clean energy instead. It's a false fantasy and as such corrosive, because it comes for free and without genuine consequence or sacrifice, it sets up a false fantasy, the predominantly American liberal fantasy that the world's problems could be fixed with very little effort if we just made a few different choices, when in fact changing course would require great sacrifice.
1) If a real company like Stark Industries just stopped making weapons, the government would likely come in and claim the material, so there's zero normative value to that plot development.
2) Stark stopped making weapons because he could now focus on cheap, unlimited energy. There's no actual sacrifice involved, Santa Claus gave him a golden goose so he discarded some problematic gold bars. That's hardly a prescriptive formula for weapons contractors.
In the real world, if we wait for miracles to make sacrifices, we'll never make sacrifices.
As a contrast, I find the bomb that Wayne built in between TDK and TDKR to be vastly more interesting. Notice the similarities: Stark is suffering from PTSD, Wayne is suffering from depression. Both men are intelligent and rich. Stark builds 52 suits in a year and they work immediately and save the day. Wayne tries to build a bomb, fails, and this has consequences.
The latter is actually a more robust and honest look at technological development. It takes time, effort, and sacrifice, and failure always precedes success.
3) Everything is easy for Stark in IM2 and IM3 (less so in the better-written IM1). In IM2, his father gives him the formula for a new element so he chills out and synthesises it in less than an hour. In IM3, he builds 52 suits within a year, a new and updated artificial intelligence system, he cures the extremin in Pepper with little effort. It all comes easy, we do not see him struggle at all. Kids are going to watch this gross **** and internalise that invention and discovery is supposed to be trivial if you have "natural intelligence".
I have worked in education. I have TAed classes, dealt with thousands of undergrads, personally tutored dozens, I've learned things that when I knew them I was the only person alive to know about them, and let me tell you: real learning and invention is hard. I got so tired, over the years, of kids I was tutoring tell me that they were bad in math, and then often within a couple hours of efforts they know the material just fine. They somehow didn't understand that it was supposed to take work, in part because they had grown up watching Hollywood which teaches us that nothing is supposed to be hard if you're awesome.
Note that it doesn't need to be this bad: the first Iron Man was better. When he builds the suit in the cave, first of all it takes him a week and not an hour, and we see him building. Second, the suit doesn't work great the first time. Third, he's not actually building the suit from scratch. I found that the movie communicated that he was actually putting together knowledge that he had spend the previous several years putting together, that his prior struggles were paying off.