A neat bit of code? Yes. Startling? No. There's no telling how long most of these victims would have lived. Once suicide is factored out (which it looks to be in this graphic because total gun deaths in the US is closer to something like 30,000 people) the remaining vast majority is from gang violence and crime. Guns themselves don't cause people to choose to be in a gang or fight another gang or commit a crime. Those lives may just have easily been lost to knives or other blunt weapons. There's just no way to know what would have happened to them.