If guns are designed specifically to kill people then they are terribly designed. Ninety nine percent of all guns have never fired on a person and 80% of all gun shot victims survive.
A car is a much more effective killer of people than a gun will ever be ... and it comes with it's own soundtrack.
So are you saying that guns AREN'T designed to kill people? However, what is the rate of people purposefully killed by a car as opposed to a gun. Also, there are literally 10s of 1000s of car accidents a day where nobody is killed.