Haven't heard anyone talk about this metaphor from Age of Ultron, so I'll just talk about it now.
See, the thing about Ultron is that he isn't just a rogue AI, he represents Tony Stark's evil: all of his traits(sarcasm, ego, genius)are Tony's traits, only with the redeeming traits of Tony removed and all the bad exaggerated to omnicidal levels.
Which is why it is super fitting that Wanda, perhaps one of Tony Stark's greatest victims(her family killed by his weapons, her brother died because of his creation) is the one who kills Ultron: she is literally the consequences of Tony Stark's sins coming back for revenge. But the problem is, Tony Stark has changed, and he is no longer the man he once was: he actually is now a hero, and thus Pietro(and Wanda's) revenge on him would be meaningless because the Tony Stark they hated died in a cave with a man named Yinsen.
Luckily, the universe provides a substitute for the evil Stark: Ultron Himself, who(as mentioned above) is all of Tony's evil and worse. Everything Ultron does to Wanda and her brother is basically Tony x1000: he destroys Slovakia and steals Wanda's family away from her, but he plans to do the same to the entire planet. Thus, Wanda effectively gets to both get her revenge on Stark and save the world, without actually killing Iron Man.
Speaking of which, I wonder if the quote in the picture was what Wanda fantasized about saying to Stark if she ever met him and got her revenge: it fits pretty well if you think about it. #movies #video