Charlie: car ownership and gun ownership don’t match up. Most families have a car and maybe two, but not usually more. With guns, lots of people have no guns at all, and many of the people who do have guns have several or lots.
A more sensible statistic would be percentage of households owning guns, rather than simple number of guns. My bet is that it would turn out that having a gun in the house is a lot more dangerous than you think, especially if there are kids around or the gun owner drinks/drugs. (And don’t pretend there aren’t Yidden who fall into that category.)
I can use a gun and also drive a car. Both are very dangerous.