I endorse Jack B Nimble's answer. However, I think it's worth bringing up that this idea is not necessarily unique to Iron Man. There is some precedence for this or something like it in other superhero stories.
Batman (1989) from wikiquote:
Batman: Excuse me. You ever danced with the devil in the pale
moonlight? [punches Joker and knocks him against a bell, before
grabbing him] I'm going to kill you.
Joker: You... IDIOT!!! You made
me, remember? You dropped me into that vat of chemicals. That wasn't
easy to get over, and don't think that I didn't try!
I know you did. [Batman punches Joker in the stomach and knocks him
through a wall. He grabs him and helps him up only to punch him in the
face again. Joker stands up, muttering and clutching his mouth until
he spits out a chattering teeth toy. He retaliates by punching Batman
in stomach, only to break his fingers on the body armor]
killed my parents.
Joker: What? [spits blood on the floor] What are
you talking about?
Batman: I made you; you made me first.
Also, in Frank Miller's Dark Knight graphic novel, there's a psychologist that is shown arguing on talk shows or news or whatever that the villains act the way they do out of a psychological need induced by Batman's existence and actions.
But there's an even more "meta" way of looking at this--more than 99%, probably, of all super villains literally only exist because the creator of the superhero needed someone to actually challenge the hero to keep the reader interested. So this concept that "the hero is the source of the villain's existence" is true in an extremely literal sense--I'm guessing that at least Frank Miller was going for exactly that concept as a wink to the reader.
It's also true in the real world--for examples, see the book Blowback talking about this happening with American foreign policy or the USSR's experience with having more enemies in Afghanistan after they left than there were when they went in to fight them.