The Janitor observed a suspicious person entering the building, carrying a package, then leave again in a hurry, WITHOUT the package.
He feared it might have been a bomb, so they called in the bomb squad.
Should he have investigated it himself?
Maybe tripped a wire and set off the possible bomb?
And even if he did - against all common sense - investigate it himself...
A blow-up doll can contain more than just air.
Nowhere in a janitor's job description is there any mention of investigating bombs or risking his life.