...The accident could have been prevented or minimized by requiring commercial air nailers to use the same interlocks required on homeowner versions. With the commercial gun, you hold the trigger down, bounce it against the surface and it nails every time. The more restrictive ones require both a bump and a trigger pull for each nail.

What "homeowner versions"? The "commercial" ones I have (Stanley-Bostitch)give you a choice.

They come from the factory so only a bump while you hold the trigger will shoot a nail. I find this option to be a PITA because if the gun bounces it will shoot multiple nails in the same spot. My first thought also was this is dangerous as hell! Just way too easy to shoot by accident.

They include a modification kit which I installed that will convert the gun so that you have to push the nose down against your work first then pull the trigger to shoot a nail. Much safer.

As far as I'm concerned the ONLY way any gun should equipped is the second way. By shipping it equipped the first way and offering an option you just invite the brain dead (or soon to be!) to use it that way.

-Hal