<There would have been far more than 3,000 casualties over the history of aviation from fights between passengers and accidental discharges that perforated the cabin.

Why it is automatically assumed that an armed society would routinely be shooting at each other puzzles me. The crime rate in the Old American West, when most people had guns, was lower than it is today in such Eastern cities as New York. Almost everyone drives a car, but the number of people who run around deliberately running over pedestrians seems rather small.

In my country we don't have a gun culture, and although we only have 1/10 the population of the USA, the gunshot fatalities are ~100 per year.

Don't know what country that is, but culture is a lot more important than gun ownership in discussing the gunshot fatality rate. Most U.S. gun fatalities are criminals shooting at each other.

I got this here:

The Swiss, New Zealanders and Finns all own guns as frequently as Americans, yet in 1995 Switzerland had a murder rate 40 percent lower than Germany's, and New Zealand had one lower than Australia's. Finland and Sweden have very different gun ownership rates, but very similar murder rates. Israel, with a higher gun ownership rate than the U.S., has a murder rate 40 percent below Canada's. When one studies all countries rather than just a select few as is usually done, there is absolutely no relationship between gun ownership and murder.