Thanks for the link Mike, it's very useful: however, IMHO it backs my argument a bit... you're right, even 3% is a tragedy, but I remain convinced that proper training can prevent such tragic accidents from happening to armed flight deck crew. For instance, between a third and a quarter of all accidents happened to children or teenagers- an excellent argument for keeping firearms secure and away from minors, but irrelevant to this discussion. Is there a similar link which can say how many of the adults killed accidentally were killed by trained personnel, and how many in hunting accidents, drunken misadventures and the like?
I may be naive, but I retain my belief that trained professional aircrew can be trained in the use of firearms, and will treat their carriage as professionally as their other duties.