I'm still popcorning the hell out of this, btw.

Although I have to say--I don't understand the "gray area" odds-playing with respect to the derringer. I always figured, no, I really don't need a gun, but if I'm going to carry one, it might as well be a reasonably useful one. That's why I don't carry a pocket .380: I can't shoot them worth a damn. The incredibly minor increase in inconvenience between that and a subcompact dramatically increases the range, accuracy, shootability, and oomph-factor. It's an efficacy-node--larger guns are only slightly better (in my hands/jurisdiction), smaller guns are hilariously worse.

Unless you're literally just carrying a little derringer to say you have a gun, at which point admit that you're carrying for the novelty of it and that you selected it purely out of convenience, and not because it's actually useful.

And no, "gun > no gun" does not justify such a choice.