> even a civilians here feels like sometimes people get mad and just shoot each other

Outside of Florida, with its incredibly relaxed "stand your ground" laws, this isn't really an issue in most of the US. When civilians do go around shooting people like that, they usually get arrested and imprisoned. In Florida, especially if you're a retired cop, you can shoot people for talking on their phone in a movie theater, though. So maybe avoid that state if you value your life.