The Kellerman study has been thoroughly discredited from many angles, including the fact that it used neighborhoods with high criminal populations, and counted rival gangs as someone you know. It even counted, for example, if you had a gun in the house, never used, and a rival gang-banger of your son's came in and shot somebody. Your gun had nothing to do with the violence, but it's counted towards Kellerman's total. On the other hand, if you pointed a gun at the bad guy and he fled, that was not counted as defensive gun use. There are many other problems with the study. It would take a whole article to detail them all.
Kellerman's study was also not formally peer-reviewed, and he still refuses to provide the raw data for outside analysis.
Other studies show between 100,000 and 2.5 million defensive gun uses per year, far outnumbering gun deaths even counting suicide.
Japan has far more suicides, yet no guns. Explain. And, in a free society, who are we to legislate that someone can't kill himself by his desired means as long as he doesn't injure another in the process?