en.wikipedia.org
Not advocating one way or the other (especially with two misses in a crowded mall food court), but it's not outside the realm of possibility depending on your personal convictions on why you carry and who you're willing to protect.
I'm not going to judge someone's personal decisions on that spectrum either way - it can go from "if you're not carrying, you're not being responsible for your own safety so I'm not helping you" to "I'm one of a single-digit percent of folks likely to be able to stop this now, and I will," with "should I or shouldn't I? What if someone else thinks
I'm the bad guy?"
Lots of things to think about in a time where thought will be a precious resource. Each person should make up their mind before hand.