I searched your “statistical breakdown of gun deaths” and a bunch of articles came up
https://www.rd.com/article/gun-violence-statistics/
Actually this article and chart broke down who died
Surprising small amounts of children .
Mostly criminals killing each other
There are no "72 million gun owners".
Gun owners are not registered in the United States.
There are various estimates of gun ownership. 72 million is on the low end. 150 milion is on the high end.
About half the households in the United States have guns in them.
The correct comparison of guns to cars would be accidents which occur with guns to accidents which occur with cars.