fine, fine. Lets see, how is a gun a better killing tool than a knife. hmm. Well, for one, a gun is more deadly, you are much more likely to die if you are shot in the head than if you are stabbed in the chest. Two, if you are attacking someone who is unarmed with a knife you give them a chance to defend themselves as you have to get close to them to hurt them, with a gun you can shoot from from a distance giving the person absolutely no chance of stopping you. Three, you can kill a lot of people in a very short amount of time with a gun, while it would take much longer to kill multiple people with a knife.
Just think about it for a second, if knives were just as deadly as guns how come the army doesn't save themselves billions of dollars a year and just invest in knives for soldiers to use instead of guns?