They are the ones who overreacted, in a major way.
Maybe after they saw the first one wasn't a bomb. But had they not reacted and it was a bomb you would be slamming them..... Why didn't someone let them know these signs were going to be put up? It is easy to call and inform the city or get a permit.
"It is easy to call and inform the city or get a permit."
It is just as easy to look at the suspected device and determine if it is a threat.
All kinds of refuse could look like something threatening, do we spend a half million every time someone finds a suspicious looking piece of trash? Who is at fault then?