I keep hearing that argument. But, I also keep hearing about that guns are dangerous. So are a lot of things like motorcycles, or just walking down the street. If I am put in the position where I have to kill someone to keep them from killing me or someone else, I want the proper tool for the job and the best too I can think of for that purpose is a gun.
Motorcycles are very dangerous, 3162 deaths for a little over five million motorcycles registered. I've heard numbers of licensed motorcycles is only a little over two million. So, even thought they may have a legitimate purpose other than killing, they are pretty damn efficient killing machines, about 9 times better than the 180 million guns estimated to be in the hands of the 80 some odd million American gun owners.
Guns have other purposes too, like making salads.