The workers are scared because an idiot ex-employee comes into the office with a video camera and what else.
If someone did that to us in our office, he would be tackled, down on the ground, and held there until the police come and arrest the guy for trespassing, and more. That camera would be held as evidence and given to the police for what he did. If he wanted his money so badly, he could of gone to small claims court which would of hurt the boss and the company much more.
Simple as that.
But he wanted a reaction, to create a disturbance and more.