I agree, it's callously phrased, and I'd probably say it differently if I'd been more thoughtful. However, I think it's a valid question, or within shouting distance of a valid question, for people there -- they were with their families in what was supposedly a safe and festive place, and that situation got up-ended in just about the worst way possible.

Incidents like this one and the Pioneer Square terrorist attack from a few years ago constitute significant breaches in the illusion of comfort and well-being with which we surround ourselves, particularly during the holiday season. Does such divergence from the artificial normal permanently taint the observance?