For me... day to day life is my scenario. Being armed is simply being ready (the best you can) and not being an automatic victim.
Because I can. Because I want to. Because this is America.
The really true logical thing is, I want the odds in my favor of surviving day to day and going home. We live in an increasingly unstable world, full of unstable people. People get hurt or killed doing just normal activities. Even shopping. That's why I don't do malls.
I don't carry to be a "hero" or protect others. I'm not a cop. Don't wanna be. If the situation arose, I'd do it, but personal protection and the protection of my family is my top reason.
I never leave the house unarmed.