Read On Killing by Col. Dave Grossman. It will enlighten you. It follows warfare and personal and impersonal killing from early musket days to today. In WWII only 15-20% of soldiers actually fired their weapons at the enemy. After the war the military looked at these stats and revised their training. Rate was up to 55-60% in Korea. Further revisions were made. That figure was raised to 95% in Vietnam.

The stats don't lie - even trained soldiers in WWII had only, at best, a 20% engagement rate. At that was TRAINED. Want to bet what percentage will "fight back" on a plane? And how long will it take them to do so.

No thanks, I'll stick to the trained (with all the new methodologies) FAMs, FFDOs and LEOs.