Taking care of Tony is a lot of work. Especially when you’ve only got one arm. And your code dates back to the 1980s.

"When Tony is pinned down, armourless, in a workshop during an assault on Stark/Avengers Tower, Clint is meant to be the cavalry. When he arrives, though, he finds that the enemy may have picked the wrong workshop to try and take Tony in. JARVIS, it turns out, really doesn't take prisoners. Author's Note: Clint and Tony, Tony and his babies, basically. Came out ... rather darker and more violent than I anticipated -_-; No, seriously. VIOLENT."

When Tony Stark was seventeen years old, he built his first AI. On that day, he ceased to be his father's creation, and became a creating force in his own right. That one act likely saved his life, and not always in the most obvious ways.