Re: When to use your weapon...
The weapons must always be the extrema ratio, in other words: use them only when you have not any other sort of "getaway", when you have not any other chance to preserve "something" called life.
Anyway, in Italy, better never use weapons. This is valid also for law enforcements. Odd, sure it is. But the consequences are great troubles, always. Maybe for that, here, is not easy have a carry license.