Or firearms ownership, or vehicle ownership, or ownership of pointy sticks, having kids, etc...
Stewardship is pretty easy. I know where my ammo is, it's locked up, and I know when it's unlocked and leaves. I've never understood how people are irresponsible enough to let their ammunition leave their custody chain. If your firearm doesn't ever leave your stewardship paradigm, why would ammunition be any different? Ammunition doesn't have legs, it only goes where you allow it to go.
Poka Yoke - colloquially called "bubba proofing" in the US - is pretty easy for ammunition stewardship. Lock the box. Crisis potential eliminated.
