[philip1209]

I think you could argue this either way with security training vs. destructive tendencies vs. PTSD risk - but one of the core competencies is experience with risky situations and a proven history of not leaving post during an emergency. Much of the value of a security guard is having a level-headed authority when something goes awry - whether it is a fire alarm, a police officer inquiring about the party, a boisterous crowd in line, or a person who needs to be removed. Think of it as a "designated driver" as much as a protection.