I never did have to stare down armed resistance to household duties and I did start training my sons to bear arms ~3. When I went to high school in Alaska it was not uncommon for students to bring firearms to school on the bus, so they could hunt on the hike home in season. Normal peer pressures and shenanigans were constant factors at school, including fights and such, but no one ever threatened anyone with guns.

Guns are tools, and tools are useful for specific jobs. Guns are for killing, not for competing over Mary Jane's rotten crotch or the like. When kids are raised to be competent with tools like guns, cars, and chainsaws, they tend not to misuse or abuse those tools at all.

It's the incompetent you have to watch out for.

Edit: I should add that I started firearms training ~3, Chainsaws ~8, and cars ~10. This reflected the relative dangers and difficulty of handling each type of tool, and how necessary they were to my sons. Firearms are simple, easy, and utterly critical to survival. Kids are competent to survive under fire from an early age, and this is revealed in the history of humanity in the fossil record.