system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU/Civil War] Is Vision's argument valid? (spoilers)

Vision makes the argument that simply by existing, Superheroes invite extreme danger and catastrophe, implying that if there weren't any Superheroes then the threats wouldn't have to reach such ridiculous proportions to challenge them. 

Where would the MCU be without any superheroes? What threats or villains would have emerged on their own anyway and could the world have dealt with them on its own without "super" intervention?
gpt
A similar argument has been made about nuclear proliferation, which proved true up to a point: Once two opposing powers had the technology to manufacture atomic bombs, they started building more and more and bigger and bigger ones in the hopes of guaranteeing victory in a conflict both sides regarded as inevitable.

And a lot of the threats the Avengers have faced have been a direct result of the existence of the superheroes. The Iron Monger and Vanko's legion of drones and Whiplash armour were all built in response to - and based on - the existence of Iron Man; the Abomination was created to try to make a weapon that could stop the Hulk; and Iron Man himself built Ultron.

But there are also major threats that cannot be blamed on the heroes. Hydra's killer helicarriers got their funding because of the Battle of New York, but the ancient evil terror organisation could undoubtedly have found other revenue streams if it came to it. The Chitauri invaded basically because the Tesseract was on Earth, which it had been for long enough to have been walled up in a mediaeval church. The Mandarin is the product of an insane and opportunistic genius with a damaged ego; Tony Stark's involvement is mere coincidence.

The superheroes have undoubtedly caused a lot of trouble, but they've also been vital to saving the world from threats that would have emerged anyway.