How to stop auto attack on security forces

I just ditched my started ship for a Katana. Man, what a difference!! I am trying to build some rep with the ANT by killing station criminals. As soon as I kill one, my ship auto-attacks security forces, causing me to become a criminal now. I'm sure I can stop this, but I can't find a way to stop it. Thanks

Edit: I was looking in the behavior setting and didn't think of looking at weapon groups (it seems so obvious now) to change my turret settings.