That’s not what happened. The guns were used with real ammo at a range to go shooting, then used as prop guns later without properly checking that there were no live rounds or lodged bullets in the guns.

And I’m not minimizing them, I’m telling you the actual solution isn’t modifying the firing pin, or changing the rules, since the rules work. These deaths were due to idiots breaking the rules, but the rules have worked to prevent thousands of deaths, and if followed no one will ever dies.