[Jeff Johnson]

...
A defender of that make of gun might give all sorts of excuses (more of that particular gun in people's hands so more chance of an ND, or people need to be better trained, and so on). But when the ND happens more often with one gun than another, it's stupid not to think about fixing more than just the people involved.

However, this is still pure speculation regarding this incident, from what you reported. While you've not named the make that you suspect, I would assume that you're thinking about something without a thumb safety. Perhaps a DAO or LDA mechanism.

BTW, do you have a link to the story?

 

[Jeff Johnson]

Ah, I saw your post on packing.org, where you did provide a link.

The article is skimpy on details.