Not a National Security Issue when Nahidmobarekeh Spreads Dried Human Feces on Pastries?

Here's a guy with a foreign sounding name, possibly of Middle Eastern orgin, who got caught sprinkling dried, grated human feces on pastries at a Fiesta grocery store. The guys name is Behrouz Nahidmobarekeh. A 49 year old cab driver. But the FBI determined that it (or he) was not a National security issue.

So, sprinkling dried feces on foods in public places where the possibility of human pathogens may exist in the feces is not considered a terrorist threat or a National security issue? Can the FBI elaborate a bit more? Say, that Behrouz was just a nutball but with a suspicious sounding name?