In this day and age, there’s really no reason why anyone should be killed while playing with a firearm. All the firearm safety information needed to prevent these deaths are out there on the internet. Anyone can access it whenever they want.
The problem is, most people don’t avail themselves of this information unless, say, they were going to buy a gun. The people who most need it, though, often don’t even realize they’ll need it.
That’s why tragedies like this one happen.