The concept of "improved" is tough to fathom. It can mean many things. Guns have made the killing easier and less personal. Smashing a persons skull with an axe or gutting them with a sword is about as personal as one can get and requires great personal skill and courage. Shooting an enemy from a distance requires little of the same quality of bravery. There is more killing done by bombs and artillery than soldiers. The gun made it easier but not more or less common.
