Look, here's how this thing works and even children can figure this out. If we take the guns then they'll use knives and if we take the knives then they'll use rocks and if we take the rocks then they'll use refrigerators.
People have been killing since Adam bore his own children (Genesis 4:8). On that grand scale, we have only begun to have guns, so I think history has taught us fairly well that the gun theory is absolutely asinine.
Tell the families of victims murdered by anything but a gun that it wouldn't have happened if we didn't have guns. Let us see if that makes it all better.