Modus Ponens, point five oh.

So, given the following statements:

1. "The only thing that stops a bad guy with a gun is a good guy with a gun."


2. "Guns don't kill people, people kill people."


3. "Don't shoot anything you wouldn't want to kill."

I turn the crank and get "Society would be better off if we had more people who were willing to kill."

Am I missing something, here?