My point was that guns change the way people think and they influence the decisions that people make. If this guy didn't have a gun, he probably wouldn't have opened the door and attacked this kid who went to the wrong house.
If George Zimmerman hadn't had a concealed gun, he probably wouldn't have stalked Trayvon Martin around the neighborhood before getting into a physical altercation with him and killing him. For the record, I agreed that the law was on GZ's side, but it shouldn't have been. He instigated that entire conflict.
If Michael Dunn hadn't been armed, he wouldn't have gotten into an altercation with 4 black teenagers and shot Jordan Davis to death.
People who think they can just legally shoot someone think and act differently than people who are unarmed and face the possibility of getting knuckles to the face. Or people who think they can legally shoot someone think and act differently than those who think they might get into legal trouble if they shoot without sufficient justification. States like Florida and Missouri have made it easier for the average paranoid, angry white male to shoot someone. Consequently, they're more likely to behave like vigilantes.
So yeah, as I said, it's the fucking guns.