911 or a gun?

Remembering Sandy Hook

Which gives you a greater chance of survival...?

1.  You hear glass breaking downstairs,  you, wife, 2 daughters upstairs, you call 911, you have a revolver, voices coming up the stairs, do you use it?

2.  A hooded figure walks quickly into a school, asks for the office, ignores you, walks toward a classroom, do you call 911?  Ask for a student ID?  Where's security??  Use of a gun?

3.  A guy walks up the aisle to the preaching pastor during church, a gun very visible , shoots him dead, walks out whistling. besides calling 911, if you had a gun, would you have confronted him? 

The above scenarios happened. Calling 911 was secondary.  Without a gun, all ended badly. With a gun, maybe survival.