I kind of think the point has been missed by some.
2. If I ever need a gun, simply having one will be enough.
3. If having one isn't enough, simply pulling the trigger will be.
4. If simply pulling the trigger isn't enough, putting a hole in a bad guy will be.
I have a gun and presented it....I shot the gun ( not warning shot but might have missed the moving target

)...I hit the bad guy ( maybe second or third shot )
My thinking is not too often is the bad guy gonna keep coming unless he has a vendetta against me or family personally. ( Although he might return fire which is a real possibility )
I've known a lot of druggies during my days and none of them wanted to (or were willing to) get shot.