system
Given the following post, respond as if you're commenting on Reddit:
human
[MCU Civil War] Vision could have ended the fight pretty quickly. Why didn't he start fighting until near the end of the airport scene?
gpt
Because they weren't really trying to beat them up.  They wanted to convince them to cooperate.  

If Vision came in and upped the ante right from the get go then Tony would be bringing a gun to a knife fight.  They kind of overkill would instantly change the dynamic of the fight.  Which would make it much much harder to convince Cap and the others.  Despite the fight, brute force wasn't the first choice because Tony knows being beaten up doesn't stop Cap.

In the comic universe, there's a point of no return where one side kills a hero on Cap's side.  It was sort of an accident, but after that shit got real in a hurry.