Statistically, the problem isn't keeping scary guns away from everyone, because the vast majority of people will never shoot anyone. The whole "you're more likely to shoot a household member than an intruder" is a red herring, because the vast majority will do neither of these things. What matters is disarming the suicidally depressed, as well as a subset of people who are disproportionately likely to commit violent crime. 60-85 percent of gun deaths in the US are suicides, jurisdiction dependent. The prototypical gun homicide in the US is a young minority man with a criminal record being killed by another young minority man with a criminal record using an illegally-possessed handgun, usually involving street gang disputes and/or the illegal drug trade.
So what matters is being able to disarm people who exhibit violent tendencies and/or suicidal depression "left of bang."