Which is why we dont use them but for defense. -_- Not everyone is going to use them responsibly. We could say your kitchen knife can be a weapon that is used to kill your next door neighbor. Right..
A gun can be used for many things, why else do you think some storekeepers keep guns in their stores? To shoot their customers? No, to protect themselves from those that do misuse them. Should no one kill another with a gun, then there would be no use for them.