Guns go off accidentally; they can kill passengers, crew members, cause structural damage and in certain cases go through the plane’s fuselage causing everyone to be ejected from the plane due to explosive decompression.
Nothing like starting a Monday with a good laugh. My recommendation is for them to get cable and watch Mythbusters:
It requires a major structural catastrophe to create an explosive decompression and still, not everyone will get “ejected from the plane.”
Such was the case of Aloha Airlines Flight 243 which basically lost half the roof of the cabin and only had one death.
And, by the way, guns don’t go off accidentally. Seriously, stop watching so many movies.