It's only an issue when you don't understand the nature of the game. When you have everything you need and the only threat to you and your group are other players, shooting first is almost always the quickest, safest and easiest way to eliminate the threat. I don't think it is fair to fault some/most players for taking the path of less resistance. Like I said, it is often the only way to guarantee your survival. If you want to go around and try to make friends in a post-zombie apocalypse world be my guess, but don't act surprised when most other players don't share your optimism. Some will want what you have and some will just want to protect what they have at all cost. It is all part of the game.