I suspect that the set of people who publicly "appear distressed" (definition of which is entirely subjective) is quite a bit larger than the set of people who

I suspect that the set of people who publicly "appear distressed" (definition of which is entirely subjective) is quite a bit larger than the set of people who commit violence. I also suspect that the former is not necessarily a superset of the latter. In other words, casting a wider net means you'll scoop up a lot of innocent people, with possibly devastating results for them.