Please see the below website, which summarizes research results from Harvard Injury Control Research Center (papers on Guns and Death) with results about homicides, suicides and accidents. http://www.hsph.harvard.edu/research/hicrc/firearms-research/guns-and-death/index.html
If you legally own and take good care of guns, great. However, you are not the only person who can use your guns if they are stolen, knocked from your hand, etc; and some legal gun owners (not yourself, of course) are unstable, unpredictable when angry, lend their weapons to friends, practice while drunk and teach their cute 3 year old how to shoot. The more legal gun owners there are, the more of the above type of gun owners there are. Canada has a much lower rate of gun-related deaths than the US. Why? Gun laws, not lack of criminals.