Years ago, there was a mass casualty drill at PNC Park in Pittsburgh. Near the end of the drill, someone put a large bag in the decon area. I don't know if this was something the Feds did as part of the drill or if someone just left a bag in the wrong place.
Someone attempted to declare an emergency and cordon off the area. By that point, most people were exhausted and sick of the drill--and they simply ignored the cordon. The drill fell apart at that point. They "knew" it wasn't a bomb.
I was cold, soaked from d-con and only wearing a pair of swim trunks when I walked past the suspicious bag. I remember thinking that if someone had wanted to kill a whole lot of EMS, police and fire (even most of the victims were off-duty public safety), a bomb in that bag would have done it. And at that point, I didn't care.
That's exactly the sort of stuff that gets you hurt or killed.
I'm in a new line of work now.