2.8% is even worse than I’d have guessed.

2.8% of an already rare event is technically non-imaginary, but also definitely rounds down to imaginary.

[edit] on top of that, is it even a one-digit percentage of that 2.8% of a rare event in which having a round chambered made any difference? Yet there are people confidently posting as if it’d be absurd to carry without a round chambered. That’s plainly nuts.

That's only active shooter events. There are other cases where armed civilians have stopped a crime. I don't have such data readily available, though.