Does this indicate you've been a victim of terrorism?

If, when in a large crowd in a public place, you hear a loud sound that you can't identify, you assume that someone is shooting? Which has apparently happened a couple of times now.

I'll throw no stones, but it should be making people stop in their tracks and ask "why is this happening in this nation?". To the best of my knowledge, few Americans have been killed as a result of foreign terrorists on American soil.