Are you saying that all three were cases of parents putting a loaded gun on their night-table, and the kid came in while they slept and shot themselves? If not, perhaps it is implied that having the gun accessible in that way will cause you to leave it out all day, everyday, even when you're at work?
As I said before, we seem to be mixing things here, and equating having the gun on the night table while you're in the bedroom with "keeping a loaded gun where a 4 or 5 year old can get it." I'm not sure I agree that the cases are equivalent.
No, I'm saying that, as a general rule, unsecured firearms are a safety hazard with young kids.