I see what you're saying (and the statistic has other problems, for example not measuring break-ins that were unsuccessful or not attempted because of the gun)

I see what you're saying (and the statistic has other problems, for example not measuring break-ins that were unsuccessful or not attempted because of the gun) but not everyone may be as responsible as you. So, it can still be a net benefit to society to pass a law which reduces fatal accidents but increases break-ins. Also, I hope that you would sell your gun if you found yourself suffering from some symptoms of mental illness, or if you had children in the house. No one ever thinks that they will be the careless gun owner whose kid finds their gun, or the drunk gun owner who threatens their spouse.