Is this a serious question? If someone has a gun pointed at me all they have to do is pull the trigger and I'm likely dead. If someone is going to kill me with a hammer, steel bar, knife or broken bottle, they have to overpower me and then repeatedly use them on me to have the same effect. From the perspective of someone who killed animals for food, it is SIGNIFICANTLY more difficult both physically and emotionally to kill something with a knife than it is with a gun.