[anigbrowl]

On the other hand, we don't live in an ideal world. If it is terrorism, then the perpetrators have an interest in avoiding capture so there's probabilities of false negatives as well as false positives.

We know that people who espouse terrorism not only fantasize but produce instructional materials on this sort of thing, so we should admit admit it as a possibility and try to estimate the probability of it being a factor here.