There have been several cities that have put a ban on handguns. And in all of them, crime went up substantially. There have been many studies done that show for a fact that guns help prevent more crimes, than are used to commit them. Guns aren't even the top weapon used in crimes. knives, and blunt objects are used more often.
Saying that all guns were specifically designed to kill people is totally false. What about my target pistol, my target rifles, or my sporting clays shotguns? I will give you that they are capable of injuring someone, but that is not why they were designed. In the whole history of the trap shooting (clays) sport (a very, very long time), there has not been one recorded fatal injury. Why? Because the people participating in the sport know their guns, and know how to use them correctly. Guns are tools to be used. How they are used is the responsibility of the owner. My dad taught me to shoot when I was 4, and I am now 26, and the whole time I have been a shooter. Name it, and I have probably shot it, pistols, rifles, shotguns, class three, etc. Not once have I felt the need to harm someone with a gun. You cannot blame all gun owners for the few people that choose to use them inappropriately.
As Andy Rooney said: "Guns do not make a killer. I think killing makes you a killer. You can kill someone with a baseball bat or a car, but no one is trying to ban you from driving to the ball game."